GE Industrial Solutions MicroVersaTrip PM User Manual

g

MicroVersaTrip Plus™ and
MicroVersaTrip PM™ Trip Units

for Type AKR Low-Voltage Power Circuit Breakers

Power Break
Power Break
R-Frame Molded-Case Circuit Breakers
Low-Voltage Power Circuit Breaker Conversion Kits

User’s Guide

GEH–6273E

® Insulated-Case Circuit Breakers
® II Insulated-Case Circuit Breakers

WARNINGS

g

CAUTIONS

NOTES

GEH–6273E

WARNINGS, CAUTIONS, AND NOTES

AS USED IN THIS PUBLICATION

Warning notices are used in this publication to emphasize that hazardous voltages, cur­rents, or other conditions that could cause personal injury exist in this equipment or may
be associated with its use.

Warning notices are also used for situations in which inattention or lack of equipment
knowledge could cause either personal injury or damage to equipment.

Caution notices are used for situations in which equipment might be damaged if care is
not taken.

Notes call attention to information that is especially significant to understanding and
operating the equipment.

This document is based on information available at the time of its publication. While
efforts have been made to ensure accuracy, the information contained herein does not
cover all details or variations in hardware and software, nor does it provide for every pos­sible contingency in connection with installation, operation, and maintenance. Features
may be described herein that are not present in all hardware and software systems. GE
Electrical Distribution & Control assumes no obligation of notice to holders of this docu­ment with respect to changes subsequently made.

GE Electrical Distribution & Control makes no representation or warranty, expressed,
implied, or statutory, with respect to, and assumes no responsibility for the accuracy,
completeness, sufficiency, or usefulness of the information contained herein. No warran­tees of merchantability or fitness for purpose shall apply.

The following are trademarks of GE Company:

MicroVersaTrip Plus™, MicroVersaTrip PM™, Power Break®, Spectra RMS™, Epic™,
POWER LEADER™

©Copyright 1996 GE Company

All Ri

hts Reserved

i

MicroVersaTrip Plus™ and MicroVersaTrip PM™ Trip Units

Table of Contents

Chapter 1. Introduction

1-1 Read This First ............................................................................................................1

1-2 Product Structure ........................................................................................................1

1-3 Trip Unit Functions.....................................................................................................3

1-4 Trip Unit Catalog Numbers.........................................................................................3

1-5 Rating Plugs.................................................................................................................5

1-6 Equipment Interfaces.................................................................................................. 6

MicroVersaTrip Plus Trip Units............................................................................6

Neutral Current Sensors........................................................................................6

MicroVersaTrip PM Trip Units.............................................................................6

POWER LEADER Communication Network........................................................6

Voltage Inputs.......................................................................................................6

Power Requirements .............................................................................................7

1-7 Trip Unit Information.................................................................................................7

Trip Unit Label Information ................................................................................7

Function Keys........................................................................................................7

Battery Function....................................................................................................8

Liquid Crystal Display ...........................................................................................9

1-8 MicroVersaTrip Plus and MicroVersaTrip PM Accuracies.......................................... 9

Chapter 2. Setup Mode

2-1 Overview ....................................................................................................................10

2-2 Operating Modes....................................................................................................... 10

2-3 Setup Mode Operation.............................................................................................. 10

Long-Time Pickup .............................................................................................. 16

Long-Time Delay................................................................................................. 16

Short-Time Pickup .............................................................................................. 16

Short-Time Delay ................................................................................................ 17

Instantaneous Pickup.......................................................................................... 18

High-Range Instantaneous Overcurrent Protection ........................................... 18

Ground-Fault Pickup........................................................................................... 18

Ground-Fault Delay............................................................................................. 19

Voltage-Unbalance Relay Pickup ........................................................................ 19

Voltage-Unbalance Relay Delay ..........................................................................20

Current-Unbalance Relay Pickup........................................................................ 20

Current-Unbalance Relay Delay.......................................................................... 20

Undervoltage Relay Pickup................................................................................. 20

Undervoltage Relay Zero-Volt Trip Enable......................................................... 20

Undervoltage Relay Delay................................................................................... 21

Overvoltage Relay Pickup.................................................................................... 21

Overvoltage Relay Delay...................................................................................... 21

Power-Reversal Relay Pickup............................................................................... 21

ii

MicroVersaTrip Plus™ and MicroVersaTrip PM™ Trip Units

Power Direction Setup......................................................................................... 21

Power-Reversal Relay Delay................................................................................. 21

Rating Plug Current Setting................................................................................ 22

Potential Transformer Primary Voltage.............................................................. 22

Potential Transformer Connection..................................................................... 22

Power Demand Intervals..................................................................................... 23

Communication Address .................................................................................... 23

Accessory Configuration Setup (RMS9D Series Trip Units Only) ...................... 23

Chapter 3. Metering Mode

3-1 Overview ....................................................................................................................25

3-2 Metering Mode Operation ........................................................................................25

Current................................................................................................................ 27

Voltage ................................................................................................................ 27

Energy................................................................................................................. 27

Total Real Power................................................................................................. 27

Total Aggregate Power........................................................................................ 28

Power Demand.................................................................................................... 28

Peak Power Demand ........................................................................................... 28

Frequency............................................................................................................ 28

Table of Contents

Chapter 4. Status Mode

4-1 Overview ....................................................................................................................29

Trip Information ................................................................................................ 29

Trip Operations Counters................................................................................... 29

4-2 Status Mode Operation.............................................................................................. 29

Normal Status Display ......................................................................................... 29

Long-Time Overcurrent Pickup Display ............................................................. 29

Trip Target and Fault Displays ........................................................................... 30

Long-Time Overcurrent Fault Display ................................................................ 30

Short-Time Overcurrent Fault Display................................................................ 30

Instantaneous Fault Display................................................................................ 30

Ground-Fault Display.......................................................................................... 31

Protective-Relay Fault Display ............................................................................. 31

Shunt Trip and Undervoltage Release Trip Displays (RMS9D Series Trip

Units Only) ................................................................................................... 31

Clearing the Trip Information............................................................................ 31

Trip Operations Counter Display ....................................................................... 31

Clearing the Trip Operations Counters.............................................................. 32

iii

MicroVersaTrip Plus™ and MicroVersaTrip PM™ Trip Units

Table of Contents

Chapter 5. Maintenance and Trouble-Shooting

5-1 Trip Unit Removal and Replacement ....................................................................... 33

Power Break Insulated-Case Circuit Breakers .....................................................33

Power Break II Insulated-Case Circuit Breakers.................................................. 33

Type AKR Low-Voltage Power Circuit Breakers.................................................. 33

5-2 Rating Plug Removal and Replacement.................................................................... 34

5-3 Trouble-Shooting Guide............................................................................................ 34

Appendices

Catalog Numbers for RMS9C Units in AK/AKR Circuit Breakers .................................. 36

Catalog Numbers for RMS9C Units in Power Break® Circuit Breakers.......................... 37

Catalog Numbers for RMS9D Units in Power Break® II Circuit Breakers...................... 38

Trip Unit Battery Suppliers............................................................................................. 39

iv

MicroVersaTrip Plus™ and MicroVersaTrip PM™ Trip Units

List of Figures

1. Front view of MicroVersaTrip PM Trip Unit (series RMS9C).................................................1

2. Front view of MicroVersaTrip PM Trip Unit (series RMS9D). ...............................................1

3. Rear view of MicroVersaTrip PM Trip Unit (series RMS9C)................................................. 2

4. Rear view of MicroVersaTrip PM Trip Unit (series RMS9D)..................................................2

5. Labels on front of Trip Unit....................................................................................................7

6. Function key placement on face of Trip Unit......................................................................... 8

7. Liquid crystal display segments...............................................................................................9

8. Operation of FUNCTION key, showing progression among Trip Unit operating modes.... 11

9. Trip Unit setup mode programming function flow.............................................................. 12

10. Trip Unit display for long-time pickup................................................................................. 16

11. Time-current curve illustrating long-time pickup................................................................ 16

12. Trip Unit display for long-time delay.................................................................................... 16

13. Time-current curve illustrating long-time delay....................................................................16

14. Trip Unit display for short-time pickup coupled with long-time pickup. ............................. 17

15. Time-current curve illustrating short-time pickup................................................................ 17

16. Trip Unit display for short-time delay................................................................................... 17

17. Time-current curve for short-time delay with

18. Time-current curve for short-time delay with

19. Trip Unit display for instantaneous pickup.......................................................................... 18

20. Instantaneous overcurrent protection set point.................................................................... 18

21. Trip Unit display for ground-fault pickup. ........................................................................... 18

22. Time-current curve for ground-fault pickup........................................................................ 19

23. Trip Unit display for ground-fault delay, showing

24. Time-current curve for ground-fault delay with

25. Time-current curve for ground-fault delay with

26. Trip Unit display for voltage-unbalance relay pickup........................................................... 20

27. Trip Unit display for voltage-unbalance relay delay.............................................................. 20

28. Trip Unit display for current-unbalance relay pickup. ......................................................... 20

29. Trip Unit display for current-unbalance relay delay............................................................. 20

30. Trip Unit display for undervoltage relay pickup................................................................... 20

31. Trip Unit display for undervoltage relay zero-volt trip disabled. .......................................... 20

32. Trip Unit display for undervoltage relay zero-volt trip enabled............................................ 21

33. Trip Unit display for undervoltage relay delay. .................................................................... 21

34. Trip Unit display for overvoltage relay pickup...................................................................... 21

35. Trip Unit display for overvoltage relay delay........................................................................ 21

36. Trip Unit display for power-reversal relay pickup................................................................. 21

37. Trip Unit display for power direction setup, showing line to load........................................ 21

38. Trip Unit display for power-reversal relay delay.................................................................... 22

39. Trip Unit display for rating plug current set point............................................................... 22

40. Trip Unit display for potential transformer primary voltage set point. ................................ 22

I2T OUT. ......................................................... 17

I2T IN.............................................................. 17

I2T out. ................................................... 19

I2T OUT. ..................................................... 19

I2T IN.......................................................... 19

v

MicroVersaTrip Plus™ and MicroVersaTrip PM™ Trip Units

List of Figures

41. Trip Unit display for potential transformer connection choice............................................ 23

42. Trip Unit display for power demand interval....................................................................... 23

43. Trip Unit display for setting communication address.......................................................... 23

44. Logic diagram for accessory configurations.......................................................................... 23

45. Accessory configuration switch on rear of Trip Unit, showing factory settings. ................... 24

46. Setting the accessory configuration switches.........................................................................24

47. Trip Unit metering mode function flow............................................................................... 25

48. Trip Unit display for current metering................................................................................. 27

49. Trip Unit display for line-to-neutral voltages........................................................................ 27

50. Trip Unit display for line-to-line voltages.............................................................................. 27

51. Trip Unit display for aggregate energy................................................................................. 27

52. Trip Unit display for aggregate real power........................................................................... 27

53. Trip Unit display for aggregate apparent power...................................................................28

54. Trip Unit display for power demand.................................................................................... 28

55. Trip Unit display for frequency............................................................................................. 28

56. Trip Unit display for normal status....................................................................................... 29

57. Trip Unit status display for long-time overcurrent pickup.................................................... 30

58. Typical fault display following a breaker trip........................................................................ 30

59. Trip Unit Status display for long-time overcurrent trip. ....................................................... 30

60. Trip Unit status display for short-time overcurrent trip........................................................ 30

61. Trip Unit status display for instantaneous overcurrent trip.................................................. 30

62. Trip Unit status display for ground-fault trip....................................................................... 31

63. Trip Unit status display for protective-relay trip. .................................................................. 31

64. Trip Unit status display for Undervoltage Release trip......................................................... 31

65. Trip Unit status display for long-time overcurrent trip counter............................................ 32

66. Removing the interchangeable rating plug.......................................................................... 34

vi

MicroVersaTrip Plus™ and MicroVersaTrip PM™ Trip Units

List of Tables

1. Breaker type referred to by first character of Trip Unit catalog number................................3

2. Breaker frame size maximum CT referred to by second character of Trip Unit catalog

number....................................................................................................................................4

3. Installed breaker CT size referred to by third and fourth characters of Trip Unit catalog

number....................................................................................................................................4

4. Trip Unit catalog number suffixes for optional functions...................................................... 4

5. MicroVersaTrip PM Trip Unit suffixes for communication, metering, and relaying.............4

6. Rating plug catalog numbers.................................................................................................. 5

7. Protective relay and metering accuracies and resolutions. .....................................................9

8. Trip-time curves for breaker types covered in this guide. .......................................................9

9. Abbreviations used in setup procedure descriptions............................................................. 10

10. Actions of function keys in Trip Unit operating modes........................................................11

11. Lower-limit delays for long-time delay bands........................................................................ 16

12. Lower-limit delays for

13. Instantaneous pickup settings for various frame sizes with and without the short-time

function................................................................................................................................. 18

14. Ground-fault pickup settings, as a function of sensor rating................................................. 18

15. Lower-limit delays for ground-fault delay bands................................................................... 19

16. Trip Unit rating plug options............................................................................................... 22

17. Accessory configuration switch settings, including factory defaults......................................24

18. Trip Unit display targets for protective relays....................................................................... 31

I2T OUT short-time delay bands.......................................................... 17

vii

MicroVersaTrip Plus™ and MicroVersaTrip PM™ Trip Units

1-1 Read This First

The MicroVersaTrip Plus™ and MicroVersaTrip
PM™ Trip Units described in this publication are
used on Power Break® and Power Break® II
insulated-case circuit breakers, Type AKR low-voltage
power circuit breakers, R-Frame molded-case circuit
breakers, and low-voltage power circuit breaker
conversion kits.

Spectra RMS™ molded-case circuit breakers use
different versions of MicroVersaTrip Plus and
MicroVersaTrip PM Trip Units that are not
interchangeable with the units described here. Refer
to GEH-5934 for information on these Trip Units.

1-2 Product Structure

MicroVersaTrip Trip Units come in two different
sizes that are not interchangeable. The larger Trip
Unit (series RMS9C) is used on Power Break circuit
breakers, Type AKR circuit breakers, and conversion
kits. The smaller Trip Unit (series RMS9D) is used
only on Power Break II circuit breakers. Each of the
two sizes is available in both MicroVersaTrip Plus
and MicroVersaTrip PM configurations. The front
views of the MicroVersaTrip PM Trip Units are
shown in Figures 1 (RMS9C) and 2 (RMS9D).

Chapter 1. Introduction

Figure 1. Front view of MicroVersaTrip PM Trip Unit (series

RMS9C).

The RMS9C Trip Unit has a 36-pin rear connector,
while the RMS9D Trip Unit has a 50-pin rear con­nector, as shown in Figures 3 and 4. These connec­tors provide the Trip Units’ main connections to the
circuit breaker frame and to the equipment control
signals.

Both types of Trip Unit have recessed connectors in
the front panel to accept interchangeable current
rating plugs.

Both types of Trip Unit have a top-mounted 20-pin
connector that provides future access to the optional
Remote Display accessory. (
normally used with a Power Break II circuit breaker.)
This connector has a removable cover to protect it
when not in use.

Series RMS9D Trip Units also have a 6-position DIP
switch, not present on series RMS9C Trip Units, that
is used to configure the Power Break II integrated
accessories. This switch is located on the rear of the
unit.

Note:

this accessory is not

Figure 2. Front view of MicroVersaTrip PM Trip Unit (series

RMS9D).

1

MicroVersaTrip Plus™ and MicroVersaTrip PM™ Trip Units

Chapter 1. Introduction

Figure 3. Rear view of MicroVersaTrip PM Trip Unit (series

RMS9C).

CCCCAAAAUUUUTTTTIIIIOOOONNNN::

must be performed with the breaker in the OPEN or
TRIPPED position. Draw-out breakers should be
racked out first.

AAAATTTTTTTTEEEENNNNTTTTIIIIOOOONNNN::

disjoncteur doit être en position ouverte ou
déclenchée. Les disjoncteurs débrochables doivent
ètre en position débrochée.

CCCCAAAAUUUUTTTTIIIIOOOONNNN::::

without its assigned Trip Unit. Installation of an
incorrect Trip Unit may result in unsafe operation of
the breaker.

AAAATTTTTTTTEEEENNNNTTTTIIIIOOOONNNN::

déclencheur. Une mauvaise installation du
déclencheur peut être dangereuse.

CCCCAAAAUUUUTTTTIIIIOOOONNNN::

breaker is carrying current reduces the breaker’s
current-carrying capacity to approximately 25% of
the current sensor rating. This may result in unde­sired tripping.

::

Removal of a Trip Unit from its breaker

::

Pour retirer déclencheur, le

Do not attempt to operate the breaker

::

Ne pas utiliser le disjoncteur sans son

::

Removal of the rating plug while the

Figure 4. Rear view of MicroVersaTrip PM Trip Unit (series

RMS9D).

AAAATTTTTTTTEEEENNNNTTTTIIIIOOOONNNN::

disjoncteur est sous tension, le déclencheur se régle
automatiquement à approximativement 25% du
calibre du transformateur de courant. Ceci peut
entrainer un déclenchement indésirable.

NNNNOOOOTTTTEEEE::

are undesirable for the specific application. Ensure
that settings are appropriately adjusted before ener­gizing.

NNNNOOOOTTTTEEEE::

standards qui peuvent être inadéquates pour
certaines applications. Vérifier ces réglages avant de
mettre le disjoncteur sous tension.

::

Trip Units as received may have settings that

::

Les disjoncteurs sont livrés avec des réglages

::

Si le calibreur est retiré alors que le

2

MicroVersaTrip Plus™ and MicroVersaTrip PM™ Trip Units

Chapter 1. Introduction

1-3 Trip Unit Functions

MicroVersaTrip Plus and MicroVersaTrip PM Trip
Units have specific standard and optional functions.
All Trip Units share a series of interchangeable
rating plugs. The standard functions for both types
of Trip Unit are as follows:

• Protection
– Long-time protection
– Instantaneous protection

• Status
– Trip target (trip type)
– Trip information (magnitude and phase)
– Trip operations counters

• Metering display
– Phase current (selectable among phases)

The optional functions available on both types of
Trip Unit are as follows:

• High-range (fixed) instantaneous overcurrent

protection

• Short-time protection, with or without I

• Ground-fault protection, with or without I

• Defeatable ground fault, with or without I

• Zone-selective interlock, with ground fault only

or with both ground fault and short time
protection

Additional optional functions available only with
MicroVersaTrip PM Trip Units are as follows:

• Available configurations
– Communication and metering
– Communication and protective relaying
– Communication, metering, and protective

relaying

• Remote communication with POWER

LEADER™ communications network
(commnet)

• Metering functions
– Voltage (V)
– Energy (kWh/MWh/GWh)
– Total real power (kW/MW)
– Total apparent power (kVA/MVA)
– Demand power (kW/MW)
– Peak demand power (kW/MW)

2

T

2

T

2

T

– Frequency (Hz)

• Protective relaying
– Undervoltage
– Overvoltage
– Voltage unbalance
– Current unbalance
– Power reversal

NNNNOOOOTTTTEEEE::

external +24 Vdc control power.

NNNNOOOOTTTTEEEE::

necessite l’utilisation d’une alimentation extérieure
24 Vcc.

::

MicroVersaTrip PM style Trip Units require

::

Le déclencheur de type MicroVersaTrip PM

1-4 Trip Unit Catalog Numbers

A simple catalog-numbering system defines all of the
standard and optional Trip Unit functions for each
of the two series of Trip Units. Catalog number keys
are found in Appendix 1 for AKR breakers,
Appendix 2 for RMS9C Trip Units in Power Break®
breakers, and in Appendix 3 for RMS9D Trip Units
in Power Break® II breakers. A208LIPMR is an
example of a valid catalog number.

The first character of each catalog number defines
the type of breaker for which it is configured, as
listed in Table 1.

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Table 1. Breaker type referred to by first character of Trip Unit

The second character of the catalog number indi­cates the highest rated phase current transformer
(CT) sensor allowed for that breaker frame, as listed
in Table 2.

rr

BBBBrrrreeeeaaaakkkkeeeerrrr TTTTyyyyppppee

A AKR RMS9C

B Power Break II RMS9D

C Power Break RMS9C

catalog number.

ee

TTTTrrrriiiipppp UUUUnnnniiiitt

tt

3

MicroVersaTrip Plus™ and MicroVersaTrip PM™ Trip Units

Chapter 1. Introduction

MMMMaaaaxxxxiiiimmmmuuuummmm AAAAlllllllloooowwwwaaaabbbbllllee

CCCChhhhaaaarrrraaaacccctttteeeerr

rr

2 2000 A

3 2500/3000/3200 A

4 4000 A

5 5000 A

CCCCTT

TT

ee

Table 2. Breaker frame size maximum CT referred to by second

character of Trip Unit catalog number.

The third and fourth characters of the catalog
number indicate the CT that is actually installed in
the breaker, as listed in Table 3. The table also indi­cates whether each CT is available with only RMS9C
Trip Units or with both types.

CCCChhhhaaaarrrraaaacccctttteeeerrrrssssCCCCTTTT SSSSiiiizzzzeeeeTTTTrrrriiiipppp UUUUnnnniiiitttt SSSSeeeerrrriiiieeeess

01 150 A RMS9C

02 200 A both

03 225 A RMS9C

04 400 A both

06 600 A RMS9C

08 800 A both

10 1000 A both

16 1600 A both

20 2000 A both

25 2500 A both

30 3000 A both

32 3200 A RMS9C

40 4000 A both

50 5000 A RMS9C

ss

Table 3. Installed breaker CT size referred to by third and

fourth characters of Trip Unit catalog number.

The fifth character of the catalog number is the let­ter L, which indicates that all Trip Units come with
long-time overcurrent protection. Additional letters
are appended to the catalog number to indicate
installed protective functions, as in Table 4. These
suffixes are valid for both MicroVersaTrip Plus and
MicroVersaTrip PM style Trip Units. They are
appended from left to right in the order given.

xx

SSSSuuuuffffffffiiiixx

S Short-time overcurrent protection

I Instantaneous overcurrent protection

H Fixed high-range instantaneous

K Fixed high-range instantaneous (AKR-30S

only)

G Ground fault

GD Defeatable ground fault (not UL listed)

Z1 orZ2Zone-selective interlock:

Z1 – ground fault only
Z2 -– ground fault and short time

X Switchable instantaneous/short time and

ground fault (AKR only, not UL listed)

PPPPrrrrooootttteeeeccccttttiiiivvvveeee FFFFuuuunnnnccccttttiiiioooonn

nn

Table 4. Trip Unit catalog number suffixes for optional

functions.

MicroVersaTrip PM catalog numbers contain an
additional one- or two-letter suffix to indicate the
communication, metering, and relaying functions
installed, as shown in Table 5. MicroVersaTrip Plus
catalog numbers do not have this final suffix.

xx

SSSSuuuuffffffffiiiixx

(none) MicroVersaTrip Plus Trip Unit

PM Metering, relaying, and communication

M Metering and communication

P Relaying and communication

FFFFuuuunnnnccccttttiiiioooonn

nn

Table 5. MicroVersaTrip PM Trip Unit suffixes for

communication, metering, and relaying.

Finally, if the Trip Unit is ordered as a replacement,
an “R” suffix is appended to the catalog number.

For example, a Trip Unit with catalog number
B210LSIGZ1PM has the following functions:

B2 -- Trip Unit for Power Break II with maximum

CT of 2000 A
10 – breaker current sensor (CT) of 1000 A
L -- long-time overcurrent protection
S -- short-time overcurrent protection

I -- adjustable instantaneous protection
G -- ground-fault protection
Z1 – ground-fault zone-selective interlock

4

MicroVersaTrip Plus™ and MicroVersaTrip PM™ Trip Units

Chapter 1. Introduction

PM -- MicroVersaTrip PM with metering, relaying,

and communication

Rating plugs for Power Break, Power Break II, and
Type AKR breakers cannot be interchanged with
Spectra RMS™ MicroVersaTrip Plus and
MicroVersaTrip PM Trip Units.

1-5 Rating Plugs

A built-in rejection feature prevents the insertion of a

Interchangeable rating plugs are used to establish or
change the current rating of the breaker. Rating
plugs for MicroVersaTrip Plus or MicroVersaTrip
PM Trip Units in either Power Break®, Power
Break® II, or Type AKR breakers are
interchangeable within the same sensor rating.

rr

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gg

CCCCaaaattttaaaalllloooogg

NNNNuuuummmmbbbbeeeerr

TR1B100 150 100 AKR30S, AKR30H TR16B1000 1000 AKR50S, AKR50H
TR1B125 125 Conversion Kits TR16B1100 1600 1100 TP1616, THP1616
TR1B150 150 TR16B1200 1200 Conversion Kits

TR2B100 100 SSD, SSF, SHD, SHF TR16B1600 1600
TR2B150 200 150 TP82, THP82 TR20B750 750 SSD, SSF, SHD, SHF

TR2B200 200 TC82, THC82 TR20B800 800 TC2020, THC2020

TR225B100 100 TR20B1000 1000 TC2520, THC2520
TR225B150 225 150 Conversion Kits TR20B1200 2000 1200 TP2020, THP2020
TR225B225 225 TR20B1500 1500 TP2520, THP2520

TR4B150 150 SSD, SSF, SHD, SHF TR20B1600 1600 AKRT50H
TR4B200 200 AKR30 TR20B2000 2000 Conversion Kits

TR4B225 400 225 TP84, THP84 TR25B1600 1600 SSD, SSF, SHD, SHF
TR4B250 250 TC84, THC84 TR25B2000 2500 2000 TC2525, THC2525
TR4B300 300 AKR30S, AKR30H TR25B2500 2500 TP2525, THP2525

TR4B400 400 Conversion Kits TR30B1200
TR6B300 300 TR30B1600

TR6B400 400 TR30B2000 3000 2000 TP3030, THP3030
TR6B450 600 450 Conversion Kits TR30B2500 2500 Conversion Kits
TR6B500 500 TR30B3000 3000

TR6B600 600 TR32B1200 1200
TR8B300 300 SSD, SSF, SHD, SHF TR32B1600 1600 AKR75, AKR75H

TR8B400 400 TP88, THP88 TR32B2400 3200 2400 Conversion Kits
TR8B450 450 TC88, THC88 TR32B3200 3200

TR8B500 800 500 AKR30 TR40B1600 1600 SSD, SSF, SHD, SHF
TR8B600 600 AKR30S, AKR30H TR40B2000 2000 TC4040, THC4040
TR8B700 700 AKR50S, AKR50H TR40B2500 2500 TP4040, THP4040
TR8B800 800 TR40B3000 4000 3000 AKR100

TR10B400 400 SSD, SSF, SHD, SHF TR40B3600
TR10B600 600 TC1610, THC1610 TR40B4000 4000

TR10B800 1000 800 TP1610, THP1610 TR50B3200 3200

TR10B1000 1000 TC2510, THC2510 TR50B4000 5000 4000 AKR125

1

Not for use with Type AKR breakers.

2

Conversion kits only.

rr

TR1B60 60 TR16B600 600 SSD, SSF, SHD, SHF
TR1B80 80 AKR30 TR16B800 800 TC1610, THC1610

RRRRaaaattttiiiinnnngggg,,

AAAAmmmmppppss

,,

ss

gg

PPPPlllluuuugg

RRRRaaaattttiiiinnnngg

gg

BBBBrrrreeeeaaaakkkkeeeerrrr FFFFrrrraaaammmmeeeess

TP2510, THP2510 TR50B5000 5000

rating plug with an incorrect sensor rating into a
Trip Unit. Similarly, a Spectra RMS rating plug can
not be inserted into a Power Break, Power Break II,
or Type AKR breaker.

Rating plug catalog numbers are listed in Table 6.

rr

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gg

CCCCaaaattttaaaalllloooogg

ss

NNNNuuuummmmbbbbeeeerr

rr

2

2

1

RRRRaaaattttiiiinnnngggg,,

AAAAmmmmppppss

,,

ss

gg

PPPPlllluuuugg

RRRRaaaattttiiiinnnnggggBBBBrrrreeeeaaaakkkkeeeerrrr FFFFrrrraaaammmmeeeess

1200 SSD, SSF, SHD, SHF
1600 TC3030, THC3030

3600 Conversion Kits

ss

Table 6. Rating plug catalog numbers.

5

MicroVersaTrip Plus™ and MicroVersaTrip PM™ Trip Units

Chapter 1. Introduction

1-6 Equipment Interfaces

MicroVersaTrip Plus Trip Units

MicroVersaTrip Plus Trip Units do not usually
require connections within the equipment, since all
wiring is contained within the circuit breaker. The
only two connections are for optional zone-selective
interlock (Z1 and Z2), made by secondary discon­nect, and the neutral sensor, which uses a special
dedicated disconnect.

Zone-selective interlocking coordinates breakers, so
that the downstream breaker is allowed the first
opportunity to clear a disturbance. The two types of
available zone-selective interlocking are Z1, which
reacts only to ground faults, and Z2, which reacts to
both ground faults and short-time overcurrent pick­ups.

Neutral Current Sensors

CCCCAAAAUUUUTTTTIIIIOOOONNNN::

single-phase, three-wire and three-phase, four-wire
systems. When the Trip Unit is connected to a three­phase, three-wire system, the neutral sensor
terminals of the breaker are left open. Do not short
any neutral current sensor terminals in a three­phase, three-wire system, as this could result in dam­age to, or malfunction of, the electrical system.

::

Neutral current sensors are required for

RMS9C-type MicroVersaTrip PM Trip Units require
a connection to an auxiliary switch within the
breaker that senses the breaker position. This
connection is not required for RMS9D-type
MicroVersaTrip PM Trip Units used on Power
Break® II breakers.

POWER LEADER™ Communication Network

The POWER LEADER Communication Network
(commnet) transmits data and instructions between
the Trip Unit and an external intelligent device. The
external device may be the POWER LEADER system,
the Epic system, or a POWER LEADER Monitor.
Devices on commnet may be up to 1000 feet apart
without signal repeaters, subject to certain con­straints. A maximum of 30 devices can be connected
without a signal repeater. Refer to GEH-5943 for
installation and operation of the POWER LEADER
system.

Commnet connections are made directly to wiring
terminations on breaker frames. All commnet con­nections to the Trip Units are made through the 36­pin or 50-pin plug on the Trip Unit, which mates
with a receptacle on the breaker frame. These addi­tional connections are made to the equipment
through the secondary disconnects of the breaker.

Voltage Inputs

AAAATTTTTTTTEEEENNNNTTTTIIIIOOOONNNN::

neutre est nécessaire pour les réseaux 3 phases +
neutre. Si le neutre n’est pas distribué, les bornes de
neutre du déclencheur doivent être laissées ouvertes.
Ne pas les court-circuiter (ceci peut endommager le
déclencheur et entrainer un mauvais
fonctionnement du système électrique.

::

Un transformateur de courant de

MicroVersaTrip PM Trip Units

In addition to the inputs received by MicroVersaTrip
Plus Trip Units, MicroVersaTrip PM Trip Units also
receive inputs from external voltage conditioners, a
+24 Vdc control power supply, and communication
connections. External +24 Vdc control power is
required for operation.

Voltage inputs are sensed by conventional instru­ment potential transformers(PTs). PTs have 120 Vac
secondaries and must always be used in groups of
three; no open-delta connections are permitted. PT
primaries are connected either line-to-line or line-to­neutral, as required.

PTs may be used for other monitoring functions,
subject to reasonable burden limitations. Note that
PTs must be connected in a specific sequence to
ensure proper phase relations and power-flow sens­ing.

Each PT output feeds an individual voltage condi­tioner that scales the nominal voltage to approxi­mately 1.76 Vac for use by the Trip Unit.

6

MicroVersaTrip Plus™ and MicroVersaTrip PM™ Trip Units

Power Requirements

A small amount of power is necessary to energize the
liquid crystal display (LCD) during setup, for
viewing breaker status, and for metering displays.
MicroVersaTrip PM Trip Units require external +24
Vdc control power for proper operation. The four
sources of such power are the following:

•

Flow of current

provide sufficient power to energize the LCD
when at least 20% of the sensor’s ampere rating
is flowing.

•+

24 Vdc control power

MicroVersaTrip PM Trip Units are supplied
with external +24 Vdc power that, whenever
present, energizes the LCD. Some breaker
models that are configured for MicroVersaTrip
Plus Trip Units may be optionally equipped to
accept an external +24 Vdc supply.

•

Internal Battery Power

internal battery that powers the unit temporarily
when the
Battery power automatically turns off 30 seconds
after the last keypad press. The battery power
supply is disabled when any current is sensed
through the current sensors.

•

MicroVersaTrip Portable Power Pack

MicroVersaTrip Portable Power Pack contains a
dc power source and a jack. The LCD is ener­gized when the jack is plugged into the rating
plug test receptacle.

•

Power Break® II Undervoltage Release and

BATTERY key on the display is pressed.

Shunt Trip Accessories

accessories supply +24 Vdc power to the Trip
Unit.

1-7 Trip Unit Information

Trip Unit Label Information

Following are descriptions of the various labels on
the front of the Trip Unit, as illustrated in Figure 5.

•

Extreme top

serial number of the breaker, unless it is a
replacement unit.

•

Upper-left corner

number, such as

-- Breaker current sensors

– Breakers with

– The Trip Unit has an

-- The

– When energized, these

-- circuit breaker series and/or

– Trip Unit-series serial

RMS9C000143.

Chapter 1. Introduction

Figure 5. Labels on front of Trip Unit.

•

Upper-right corner

ture code, such as

•

Lower-left corner

Unit, such as

•

Lower-right corner

Unit, such as

•

Below battery cover

is MicroVersaTrip Plus or MicroVersaTrip PM.

There are several other labels on the Trip Unit that
are not generally visible when the unit is plugged
into a breaker:

•

Under battery cover

•

Side of unit

bar-coded serial number of unit.

•

Rear of unit

Trip Units also have a label to indicate which
accessory functions are activated by the rear­panel DIP switches.

-- bar-coded catalog number and

-- yellow caution label. RMS9D-series

Function Keys

The Trip Unit has four function keys and a battery
enable key. These are marked

VALUE, ENTER, and BATTERY, as illustrated in Figure

6. All setup, status, and metering functions and
displays are accessed through these keys. As each set

-- Trip Unit date of manufac-

E439=.

-- catalog number of the Trip

B220LSIGPM.

-- sensor rating of the Trip

SENSOR (CT) = 2000A.

-- indicates whether the unit

– yellow caution label.

FUNCTION, SELECT,

7

MicroVersaTrip Plus™ and MicroVersaTrip PM™ Trip Units

Chapter 1. Introduction

energized breaker. Typical usage could include one
half-hour of use for first-time cold setup, 10 Trip
Unit status checks per year on a de-energized
breaker, and one or two configuration changes per
year.

Figure 6. Function key placement on face of Trip Unit.

point is entered, it is stored in the Trip Unit’s non­volatile memory, so subsequent loss of power does
not result in loss or change of any settings.

The functions of the five keys are

•

FUNCTION -- selects the mode of display.

•

SELECT -- chooses the next item for display.

•

VALUE -- selects the phase-to-phase display or

allows changing of set points.

•

ENTER -- stores set points.

•

BATTERY -- powers the Trip Unit from the

internal battery.

Chapter 2 describes the operation of these keys in
detail.

Battery Function

Pressing the BATTERY key on the face of the Trip
Unit powers the unit from its internal battery. Bat­tery power is maintained for 30 seconds after the last
key is pressed. This self-powered mode allows setting
up the Trip Unit or viewing trip targets when the
breaker is de-energized and external control power is
unavailable. All normal setup, meter, and status
functions can be performed with battery power.

The battery is

not

required for proper operation or
protection of the breaker. It is not needed nor used
to store setpoints, configurations, or trip target
information. It provides a source of power to display
setpoints and trip information only if no other
source of power is available.

Battery Replacement

Replace the battery if it does not power up the Trip
Unit or if the low-battery symbol appears in the
display when the

BATTERY key is pressed. Lift the

right-side tab of the battery cover on the front of the
Trip Unit to expose the 3.9 V AA lithium cell. A
suitable replacement is the Electrochem 3B24–XA,
which is available from industrial distributors. The
manufacturer’s address is listed in Appendix 4.

WWWWAAAARRRRNNNNIIIINNNNGGGG::

::

Replace the battery with Electrochem
3B24–XA only. Use of a different battery may present
risk of fire, explosion, or damage to equipment.
Observe proper battery polarity when installing in
the Trip Unit battery compartment.

AAAATTTTTTTTEEEENNNNTTTTIIIIOOOONNNN::

::

Remplacer la batterie avec
uniquement des Electrochem 3B24–XA. L’utilisation
d’autres batteries peut présenter un risque de feu,
d’explosion ou d’endommagement du matériel.
Respecter la polarité de la batterie en l’installant
dans son logement.

The battery is intended to power the Trip Unit when
it is otherwise unpowered. At low line currents the
Trip Unit display is not active. Pressing the

BATTERY

key under these conditions will not power the Trip
Unit.

Note that at temperatures above 40° C, the

BATTERY

key may have to be held down for up to 5 seconds for
the Trip Unit to be powered.

Batteries

The Trip Unit uses a lithium sulfuryl chloride bat­tery with a typical life of two years in a normally

WWWWAAAARRRRNNNNIIIINNNNGGGG::

::

The battery may explode if mistreated.
Do not recharge, disassemble, or dispose of in fire.
Keep the battery away from children and dispose of
the used battery promptly.

AAAATTTTTTTTEEEENNNNTTTTIIIIOOOONNNN::

::

La batterie peut exploser en cas de
mauvaise utilisation. Ne pas la recharger, l’ouvrir ou
la jeter dans un feu. Doit être garder hors de portée
des enfants. Une fois usée, la batterie doit être jeté
rapidement.

8

MicroVersaTrip Plus™ and MicroVersaTrip PM™ Trip Units

Chapter 1. Introduction

Liquid Crystal Display

Figure 7 illustrates the LCD with all segments illumi­nated. The various segments are energized in
response to conditions sensed by the Trip Unit.

1-8 MicroVersaTrip Plus and
MicroVersaTrip PM Accuracies

The accuracy data in Table 7 represent the average
expected performance of MicroVersaTrip Plus and
MicroVersaTrip PM Trip Units. These data are valid
for setup, metering, and status mode displays. These
data include the effects of Trip Unit ambient­temperature variation from 0° C to 70° C.

All percentages are based on full-scale values. Full­scale current is
plug. Full-scale voltage is the potential transformer
primary voltage rating. These data do not include
the accuracy rating of any measuring instrument.

Refer to the trip-time curves listed in Table 8 for
characteristics and accuracies of overcurrent protec­tion.

xIn

, the rating of the breaker’s rating

FFFFuuuullllllll----SSSSccccaaaallllee

ee

VVVVaaaalllluuuuee

Current (A, kA) ± 2% ± 0.5 digit

Voltage (V) ± 1.5% ± 0.5 digit

Energy (kWh, MWh, GWh) ± 3.5% ± 0.5 digit

Real power (kW, MW) ± 3.5% ± 0.5 digit

Total power (kVA, MVA) ± 3.5% ± 0.5 digit

Frequency (Hz) ± 1 Hz ± 1 Hz

Time delay (sec) ± 1 sec ± 1 sec

AAAAccccccccuuuurrrraaaaccccyyyyRRRReeeessssoooolllluuuuttttiiiioooonn

ee

Table 7. Protective relay and metering accuracies and

resolutions.

TTTTrrrriiiipppp----TTTTiiiimmmmee

BBBBrrrreeeeaaaakkkkeeeerrrr TTTTyyyyppppee

AKR GES-9910 GES-9911

Power Break® and

R-Frame

Power Break® II GES-9989 GES-9990

ee

CCCCuuuurrrrvvvveeeess

GES-9909 GES-9911

ee

GGGGrrrroooouuuunnnndddd----FFFFaaaauuuulllltt

ss

CCCCuuuurrrrvvvveeeess

tt

ss

Table 8. Trip-time curves for breaker types covered in this

guide.

nn

Figure 7. Liquid crystal display segments.

9

MicroVersaTrip Plus™ and MicroVersaTrip PM™ Trip Units

Chapter 2. Setup Mode

2-1 Overview

This chapter describes the operation of the four
function keys, set point and time-delay adjustments,
and their accuracies. The setup procedures should
only be repeated if the Trip Unit or the protection
characteristics are changed, requiring different set
points and time delays.

These procedures apply to MicroVersaTrip Plus and
MicroVersaTrip PM Trip Units. Setup programming
must be performed with the rating plug installed.

For Trip Units set up through either the POWER
LEADER™ system or the Epic MicroVersaTrip Field
Programming Unit, refer to instructions published
for those systems.

Table 9 contains a list of abbreviations used
throughout the description of the setup procedures.

AAAAbbbbbbbbrrrr....DDDDeeeessssccccrrrriiiippppttttiiiioooonn

xIn

xCT

xLT

Rating plug ampere rating.

Current sensor ampere rating.

Long–time (LT) current setting in amperes.
Multiply LT set point by rating plug amperes.

xLT

H

Short-time (ST) withstand rating of breaker in
amperes.

F FUNCTION key on face of Trip Unit.

nn

= (LT setpoint multiplier) x (

xIn

)

2-2 Operating Modes

MicroVersaTrip Plus and MicroVersaTrip PM Trip
Units have three operating modes: Setup, Metering,
and Status. The effects of each of the four function
keys in each mode are listed in Table 10.

All the function keys, except for

ENTER, automatically

step the Trip Unit display to the next available
option each time the key is pressed. Continued press­ing of a key eventually loops the display back to the
initial option for that function. This is illustrated in
Figure 8 for the

FUNCTION key, which shows that

repeatedly pressing this key cycles the mode among
Status, Metering, and Setup. Pressing the

ENTER key

more than once has no effect.

In Setup mode, depressing the

VALUE key for about 5

seconds activates a fast scan that rapidly displays
each of the available set points or time delays for
some of the trip characteristics.

2-3 Setup Mode Operation

The following instructions describe setup procedures
for all available Trip Unit functions. These are illus­trated in Figure 9. All Trip Units provide long-time
overcurrent protection, long-time delay, and some
form of instantaneous overcurrent protection when
installed in Power Break® circuit breakers. All other
functions are optional.

S

SELECT key on face of Trip Unit.

V

VALUE key on face of Trip Unit.

E

ENTER key on face of Trip Unit.

Table 9. Abbreviations used in setup procedure descriptions.

If a specific set of Trip Unit functions, such as relay­ing or short-time overcurrent protection, has not
been ordered, that function will not appear on the
Trip Unit display. Ignore setup mode instructions for
such functions.

The Trip Unit must be provided with control power
during setup. This can come from internal battery
power, from a MicroVersaTrip Portable Power Pack,
from an external +24 Vdc power supply, or by ener­gizing the breaker to at least 20% of its sensor load.

To begin the process, press the

SETUP appears in the upper-right corner of the Trip

FUNCTION key until

Unit display. Setup mode always begins with long­time pickup. After a choice has been made for this
and each subsequent trip function, press

SELECT t o

advance to the next function.

10

MicroVersaTrip Plus™ and MicroVersaTrip PM™ Trip Units

Chapter 2. Setup Mode

yy

KKKKeeeeyy

FUNCTION

SELECT

VALUE

ENTER

SSSSyyyymmmmbbbbooooll

F

S

V

E

ll

Select next programming
display

Display next set point or time­delay value

Store set point or time-delay
value into memory

SSSSeeeettttuuuupp

pp

Select one of three modes: Setup, Metering, Status

Table 10. Actions of function keys in Trip Unit operating modes.

Figure 8. Operation of FUNCTION key, showing progression among Trip Unit operating modes.

Set points are entered into memory in three steps:
display, select, and activate, as described below:

1111....Press the

VALUE key until the desired set point

is displayed flashing on the LCD.

2222....Press the

displayed value stops flashing and the

ENTER key to select this set point. The

SETUP

icon flashes on the LCD. This indicates that
the value has been stored in memory but is not
yet active. If a new set point is displayed but not
selected by pressing the

ENTER key (set point

value still flashing), then the displayed set
point is not entered into memory and the
original value is maintained. Multiple set point
changes can be made in this fashion without
changing the active settings. For each of these
changes, the

3333....Press the

settings in the Trip Unit. The

SETUP icon continues to flash.

FUNCTION key to activate these

SETUP icon no

longer flashes, which indicates that any

TTTTrrrriiiipppp UUUUnnnniiiitttt OOOOppppeeeerrrraaaattttiiiinnnngggg MMMMooooddddee

MMMMeeeetttteeeerrrriiiinnnngg

Select next metering display Select next status display

Display next phase value No effect

No effect No effect

ee

gg

SSSSttttaaaattttuuuuss

ss

selected settings are also currently active. The

FUNCTION key should always be pressed

following set point changes to ensure that the
active settings match the stored settings.

The set point change steps are summarized as
follows:

• Display set point – Press the

VALUE key until the

desired setting is flashing.

• Select set point – Press the
stops flashing and the

ENTER key; the setting

SETUP icon starts

flashing.

• Activate set points – Press the
activate the settings; the

FUNCTION key to

SETUP icon stops

flashing.

Always confirm settings on the Trip Unit after
making changes by exiting and re-entering Setup
mode and rechecking each changed setting.

11

MicroVersaTrip Plus™ and MicroVersaTrip PM™ Trip Units

Chapter 2. Setup Mode

Figure 9. Trip Unit setup mode programming function flow.

12

MicroVersaTrip Plus™ and MicroVersaTrip PM™ Trip Units

Chapter 2. Setup Mode

Figure 9. Trip Unit setup mode programming function flow (continued).

13

MicroVersaTrip Plus™ and MicroVersaTrip PM™ Trip Units

Chapter 2. Setup Mode

Figure 9. Trip Unit setup mode programming function flow (continued).

14

MicroVersaTrip Plus™ and MicroVersaTrip PM™ Trip Units

Chapter 2. Setup Mode

Figure 9. Trip Unit setup mode programming function flow (continued).

15

MicroVersaTrip Plus™ and MicroVersaTrip PM™ Trip Units

Chapter 2. Setup Mode

Long-Time Pickup

The first setup-mode display is always the long-time
pickup setpoint, as illustrated in Figure 10. This set
point establishes the breaker’s nominal ampere rat­ing,

xLT

, as a fraction of the rating plug value,

(

xLT

= LT multiplier x

scroll through the available choices. Press
store the desired set point.

Figure 10. Trip Unit display for long-time pickup.

The choices for UL breakers are 0.50 to 1.00 times

xln

in steps of 0.05. The pickup value tolerance band

is 0% to +20% of the set point.

The choices for ANSI breakers are 0.50 to 1.10 times

xln

, in steps of 0.05. The pickup value is defined for

−10% to +10% of the set point.

xIn

). Press the VALUE key to

xIn

ENTER to

in Table 11. Figure 13 illustrates the effect of this
delay on trip time. Press the
through the four choices of time-delay bands. Press

ENTER to store the desired value.

Figure 12. Trip Unit display for long-time delay.

BBBBaaaannnnddddDDDDeeeellllaaaayyyy,,,, sssseeeecc

1 2.4

2 4.9

3 9.8

420

Table 11. Lower-limit delays for long-time delay bands.

VALUE key to cycle

cc

Figure 11 illustrates the long-time pickup settings.

Figure 11. Time-current curve illustrating long-time pickup.

Long-Time Delay

The Trip Unit display for long-time delay is illus­trated in Figure 12. This function allows normal
momentary overloads without nuisance tripping.
The time delays at the lower limit of the bands at
600% of the long-time current setting,

xLT

, are listed

Figure 13. Time-current curve illustrating long-time delay.

Short-Time Pickup

The short-time pickup function establishes the cur­rent at which short-time trip is activated. Short-time
pickup is coupled with long-time pickup and the
choices of pickup settings are from 1.5 to 9.0 times
the long-time setting,
Trip Unit display is illustrated in Figure 14.

xLT

, in steps of 0.5

xLT

. The

16

MicroVersaTrip Plus™ and MicroVersaTrip PM™ Trip Units

Chapter 2. Setup Mode

Figure 14. Trip Unit display for short-time pickup coupled with

long-time pickup.

The time-current curve for short-time pickup is
shown in Figure 15.

Figure 15. Time-current curve illustrating short-time pickup.

Short-Time Delay

The Trip Unit display for short-time delay is shown
in Figure 16. This function delays the breaker trip on
a short-time trip. The choices of time-delay bands
are listed in Table 12. The delay with
current of 600% of
band. The delay with

xLT

at the lower limit of the

I2T OUT is for the lower limit of

each band.

I2T IN is for a

Figure 16. Trip Unit display for short-time delay.

dd

BBBBaaaannnndd

1 0.10

2 0.21

3 0.35

TTTTiiiimmmmeeee DDDDeeeellllaaaayyyyssss,,,, sssseeeecc

Table 12. Lower-limit delays for I

2

T OUT short-time delay bands.

cc

Figure 17. Time-current curve for short-time delay with I

2

T OUT.

On ANSI Trip Units ordered with the user-selectable,
switchable instantaneous overcurrent and ground­fault option, “X,” an additional value of
at the end of the delay band settings. Choosing

OFF appears

OFF

disables short-time protection. The short-time OFF
band is interlocked with instantaneous pickup, so
that only one function can be turned off at a time.

I2T OUT function, illustrated in Figure 17, estab-

The
lishes a constant time delay.

I2T IN biases the delay

with a constant slope, as shown in Figure 18.

Figure 18. Time-current curve for short-time delay with I

17

2

T IN.

MicroVersaTrip Plus™ and MicroVersaTrip PM™ Trip Units

Chapter 2. Setup Mode

Instantaneous Pickup

Instantaneous overcurrent protection, with Trip Unit
display illustrated in Figure 19, causes an immediate
breaker trip when the chosen current level is
reached. The pickup value may be set in steps of 0.5

xIn

from 1.5
frame size and the presence of the short-time
function, as listed in Table 13.

Note the difference from short-time pickup, which is
based on a multiple of
characteristic is shown in Figure 20.

Figure 19. Trip Unit display for instantaneous pickup.

xIn

to a maximum dependent on the

xLT

. The time-current

the listing of numerical values. Choose this setting to
disable instantaneous protection. The instantaneous

OFF selection is interlocked with short-time pickup,

so that only one function can be turned off at a time.

High-Range Instantaneous Overcurrent
Protection

High-range instantaneous overcurrent protection
has a fixed trip setting equal to the breaker frame’s
short-time withstand rating,

H

, with pickup tolerance
+0%, –20%. When this option is installed, skip pro­gramming of instantaneous pickup and go on to the
next function by pressing

SELECT.

Ground-Fault Pickup

The trip unit display for ground-fault pickup is
shown in Figure 21. This function sets the pickup
current for ground-fault protection. The available
settings are listed in Table 14 as multiples of
current sensor rating, in steps of 0.01
maximum value is limited to 1200 A. Figure 22
illustrates the time-current curve for ground-fault
pickup.

xCT

xCT

the

. The

Figure 20. Instantaneous overcurrent protection set point.

FFFFrrrraaaammmmeeee MMMMaaaaxxxx.... AAAAmmmmpp

RRRRaaaattttiiiinnnngg

2000 1.5–10.0

3200 1.5–10.0

4000 1.5–9.0

5000 1.5–7.0

pp

gg

SSSSeeeettttppppooooiiiinnnnttttss

WWWWiiiitttthhhhoooouuuutttt SSSSTT

ss

xIn

xIn

xIn

xIn

SSSSeeeettttppppooooiiiinnnnttttss

TT

WWWWiiiitttthhhh SSSSTT

1.5–15.0

1.5–13.0

1.5–9.0

1.5–7.0

ss

TT

xIn

xIn

xIn

xIn

Table 13. Instantaneous pickup settings for various frame sizes

with and without the short-time function.

On Trip Units with the user-selectable switchable
instantaneous overcurrent and ground-fault option,
X, an additional value of

OFF appears at the end of

Figure 21. Trip Unit display for ground-fault pickup.

SSSSeeeennnnssssoooorrrr,,,, AA

150–2000 0.20–0.60

2500–3200 0.20–0.37

AA

4000 0.20–0.30

SSSSeeeetttt PPPPooooiiiinnnnttttss

ss

Table 14. Ground-fault pickup settings, as a function of sensor

rating.

18

MicroVersaTrip Plus™ and MicroVersaTrip PM™ Trip Units

Chapter 2. Setup Mode

Figure 22. Time-current curve for ground-fault pickup.

Ground-Fault Delay

This function sets the delay before the breaker trips
when the ground-fault pickup current has been
detected. The Trip Unit display is shown in Figure

23. The choices are listed in Table 15. The delay for

I2T OUT is at the lower limit of each band. The delay

for

I2T IN is at 200% of the pickup setting at the lower

limit of the band.

BBBBaaaannnnddddTTTTiiiimmmmeeee DDDDeeeellllaaaayyyy,,,, sssseeeecc

OFF Disabled

1 0.10

2 0.21

3 0.35

cc

Table 15. Lower-limit delays for ground-fault delay bands.

Figure 24. Time-current curve for ground-fault delay with I

OUT

.

2

T

I2T OUT function establishes a constant time

The
delay, as shown in Figure 24.

I2T IN biases the delay

with a constant slope, as shown in Figure 25.

With the X or GD options (switchable ground fault),
an

OFF selection appears as an additional time-delay

set point. Selecting

OFF disables ground-fault protec-

tion.

Figure 23. Trip Unit display for ground-fault delay, showing I

2

out.

Figure 25. Time-current curve for ground-fault delay with I

T

Voltage-Unbalance Relay Pickup

This function compares the highest or lowest phase
voltage with the average of all three phases and
initiates a trip if the difference exceeds the set point.
The true rms voltage is computed for each phase.
The range of set points is from 10 to 50% of the
unbalance, with an increment of 1%. The Trip Unit
display is shown in Figure 26.

2

T IN.

19

MicroVersaTrip Plus™ and MicroVersaTrip PM™ Trip Units

Chapter 2. Setup Mode

Figure 26. Trip Unit display for voltage-unbalance relay pickup.

Voltage-Unbalance Relay Delay

This function sets the delay time before a voltage­unbalance trip occurs. The range of delays is 1 to 15
seconds, in steps of 1 second. Choosing
voltage-unbalance protection. The Trip Unit display
is shown in Figure 27.

Figure 27. Trip Unit display for voltage-unbalance relay delay.

OFF disables

Current-Unbalance Relay Pickup

This function compares the true RMS current in the
highest or lowest phase with the average of all three
phases and initiates a trip if the difference exceeds
the set point. The range of set points is 10 to 50% of
the unbalance, with an increment of 1%. The Trip
Unit display is shown in Figure 28.

Figure 29. Trip Unit display for current-unbalance relay delay.

Undervoltage Relay Pickup

This function measures the true rms voltage in all
phases and initiates a trip if any phase voltage drops
below the set point. The range of set points is 50 to
90% of the nominal voltage, with an increment of
1%. The Trip Unit display is shown in Figure 30.

Figure 30. Trip Unit display for undervoltage relay pickup.

Undervoltage Relay Zero-Volt Trip Enable

This function determines if the relay trips when all
three phase voltages drop to zero volts. The Trip
Unit display for zero-volt trip disabled is shown in
Figure 31. The Trip Unit display for zero-volt trip
enabled is shown in Figure 32.

Figure 28. Trip Unit display for current-unbalance relay pickup.

Current-Unbalance Relay Delay

This function sets the delay time before a current­unbalance trip occurs. The range of delays is 1 to 15
seconds, in steps of 1 second. Choosing
current-unbalance protection. The Trip Unit display
is shown in Figure 29.

OFF disables

Figure 31. Trip Unit display for undervoltage relay zero-volt trip

disabled.

20

MicroVersaTrip Plus™ and MicroVersaTrip PM™ Trip Units

Chapter 2. Setup Mode

Figure 32. Trip Unit display for undervoltage relay zero-volt trip

enabled.

Undervoltage Relay Delay

This function sets the delay time before an under­voltage trip occurs. The range of delays is 1 to 15
seconds, in steps of 1 second. Choosing
undervoltage protection. The Trip Unit display is
shown in Figure 33.

Figure 33. Trip Unit display for undervoltage relay delay.

OFF disables

Overvoltage Relay Pickup

This function measures the true rms voltage in all
phases and initiates a trip if any phase voltage
exceeds the set point. The range of set points is 110
to 150% of the nominal voltage, with an increment
of 1%. The Trip Unit display is shown in Figure 34.

Figure 35. Trip Unit display for overvoltage relay delay.

Power-Reversal Relay Pickup

This function measures the direction of power flow
through the breaker and initiates a trip if a sufficient
magnitude of reverse power is detected. The range of
set points is 10 kW to 990 kW, in steps of 10 kW. The
Trip Unit display is shown in Figure 36.

Figure 36. Trip Unit display for power-reversal relay pickup.

Power Direction Setup

This function selects the normal power flow direc­tion for the breaker, either from line to load or from
load to line. Figure 37 shows the setup display for
normal power flow of line to load. This direction
setup also affects the sign of the normal power
metering displays.

Figure 34. Trip Unit display for overvoltage relay pickup.

Overvoltage Relay Delay

This function sets the delay time before an overvolt­age trip occurs. The range of delays is 1 to 15 sec­onds, in steps of 1 second. Choosing
overvoltage protection. The Trip Unit display is
shown in Figure 35.

OFF disables

Figure 37. Trip Unit display for power direction setup, showing

line to load.

Power-Reversal Relay Delay

This function sets the delay time before a power­reversal trip occurs. The range of delays is 1 to 15
seconds, in steps of 1 second. Choosing

21

OFF disables

MicroVersaTrip Plus™ and MicroVersaTrip PM™ Trip Units

Chapter 2. Setup Mode

power-reversal protection. The Trip Unit display is
shown in Figure 38.

Figure 38. Trip Unit display for power-reversal relay delay.

Rating Plug Current Setting

The Trip Unit display for rating plug setting is
shown in Figure 39. Enter the current setting of the
rating plug by scrolling through the list with
and pressing ENTER when the correct value is
reached. Table 16 lists the available rating plugs for
the various Trip Units.

CCCCAAAAUUUUTTTTIIIIOOOONNNN::

::

Incorrect storage of this set point will

result in incorrect metering values.

VALUE

Potential Transformer Primary Voltage

Enter the primary voltage rating of the potential
transformer, as illustrated in Figure 40. The range of
values is 120 to 600 volts, with an increment of 1 volt.

CCCCAAAAUUUUTTTTIIIIOOOONNNN::

result in incorrect metering values. Even if this set­ting is entered remotely, it must be entered again
locally.

AAAATTTTTTTTEEEENNNNTTTTIIIIOOOONNNN::

enregistrée pour ce réglage, les mesures seront
fausses. Cette valeur doit être enregistrée locallement
même dans le cas d’une utilisation à distance avec
commnet.

::

Incorrect storage of this set point will

::

Si une valeur incorrecte est

AAAATTTTTTTTEEEENNNNTTTTIIIIOOOONNNN::

::

Si une valeur incorrecte est
enregistrée pour ce réglage, les mesures seront
fausses.

Figure 39. Trip Unit display for rating plug current set point.

rr

BBBBrrrreeeeaaaakkkkeeeerr

ee

FFFFrrrraaaammmmee

SSSSiiiizzzzeeeeRRRRaaaattttiiiinnnngggg PPPPlllluuuugggg OOOOppppttttiiiioooonnnnssss,,,, AAAAmmmmppppss

60, 80, 100, 125, 150, 200, 225, 250, 300, 400,

800–2000

A

2500–320

0 A

4000 A

5000 A 3200, 4000, 5000

450, 500, 600, 630, 700, 750, 800, 900, 1000,
1100, 1200, 1250, 1500, 1600, 2000

1200, 1500, 1600, 2000, 2400, 2500, 3000,
3200

1600, 2000, 2400, 2500, 3000, 3200, 3600,
4000

ss

Figure 40. Trip Unit display for potential transformer primary

voltage set point.

Potential Transformer Connection

Note that this step applies only to MicroVersaTrip
PM Trip Units.

Select the appropriate potential transformer connec­tion, either line-to-line (
(

Ph-N), as illustrated in Figure 41.

CCCCAAAAUUUUTTTTIIIIOOOONNNN::

::

Incorrect storage of this set point will

result in incorrect metering values.

AAAATTTTTTTTEEEENNNNTTTTIIIIOOOONNNN::

::

Si une valeur incorrecte est
enregistrée pour ce réglage, les mesures seront
fausses.

Ph-Ph) or line-to-neutral

Table 16. Trip Unit rating plug options.

22

MicroVersaTrip Plus™ and MicroVersaTrip PM™ Trip Units

Chapter 2. Setup Mode

Figure 41. Trip Unit display for potential transformer

connection choice.

Power Demand Intervals

This function sets the power demand interval, which
can be in the range of 5 to 60 minutes, in steps of 5
minutes. This setpoint specifies the time interval for
power demand averaging. The Trip Unit calculates a
rolling average of breaker power over this time inter­val. The Trip Unit display is illustrated in Figure 42.

MicroVersaTrip PM Trip Unit. Simply press
identify the unit to the FPU.

the FPU’s display must not be changed at the
breaker.

The address shown on

ENTER to

Accessory Configuration Setup (RMS9D
Series Trip Units Only)

RMS9D Trip Units have a six-position DIP switch
module on the rear of the unit that controls the con­figuration of the Power Break® II integrated accesso­ries. These switches can be set up to define the types
of signals (protection trip, Shunt trip, Shunt Trip
with Lockout, or Undervoltage Release trip) that
activate the Bell Alarm–Alarm Only and Bell Alarm
with Lockout accessories on the Power Break II
breaker. Each of the six switches enables or disables
a different path to activate these accessories from the
different types of trip signals. Figure 44 shows the
logic function for the switches.

The Trip Unit DIP switches are illustrated in Figure
45, with the factory settings shown. Table 17 lists the
switch functions.

Figure 42. Trip Unit display for power demand interval.

Communication Address

Note that this step applies only to MicroVersaTrip
PM Trip Units connected to either POWER
LEADER™ or Epic MicroVersaTrip systems.

With POWER LEADER systems, the address is
assigned at the breaker. The address options are
from 256 to 999, in steps of 1, as illustrated in Figure

43.

Figure 43. Trip Unit display for setting communication address.

With Epic MicroVersaTrip systems, the Field
Programming Unit (FPU) calls for removal of the
rating plug. This is not required for addressing a

Figure 44. Logic diagram for accessory configurations.

23

MicroVersaTrip Plus™ and MicroVersaTrip PM™ Trip Units

Chapter 2. Setup Mode

3333....When a protection trip (long-time, short-time,

instantaneous, ground-fault, or protective­relay) occurs, the contacts of the Bell
Alarm–Alarm Only also change state. The

Figure 45. Accessory configuration switch on rear of Trip Unit,

showing factory settings (solid part indicates that switch is

pushed in on that side).

Description of Switch Settings

Following are descriptions of the effects of each
accessory switch when it is

enabled

:

1111....When a Shunt Trip or Shunt Trip with Lockout

accessory causes the breaker to trip, the
contacts of the Bell Alarm–Alarm Only also
change state. The factory switch setting is

disabled

.

2222....When an Undervoltage Release accessory

causes the breaker to trip, the contacts of the
Bell Alarm–Alarm Only also change state. The
factory switch setting is

yy

FFFFaaaaccccttttoooorrrryy

hh

SSSSwwwwiiiittttcccchh

1 Disabled

2 Disabled

3 Enabled

4 Disabled

5 Disabled

6 Enabled

SSSSeeeettttttttiiiinnnnggggFFFFuuuunnnnccccttttiiiioooonn

Shunt Trip or Shunt Trip with

Lockout activates Bell
Alarm–Alarm Only

UVR trip activates Bell

Alarm–Alarm Only

Protection trip activates Bell

Alarm–Alarm Only

Shunt Trip or Shunt Trip with

Lockout activates Bell Alarm with
Lockout

UVR trip activates Bell Alarm with

Lockout

Protection trip activates Bell

Alarm with Lockout

disabled

nn

.

factory switch setting is

4444....When the Shunt Trip or Shunt Trip with

Lockout accessory causes the breaker to trip,
the contacts of the Bell Alarm with Lockout
also change state. The factory switch setting is

disabled

.

5555....When the Undervoltage Release accessory

causes the breaker to trip, the contacts of the
Bell Alarm with Lockout also change state. The
factory switch setting is

6666....When a protection trip (long-time, short-time,

instantaneous, ground-fault, or protective­relay) occurs, the contacts of the Bell Alarm
with Lockout also change state. The factory
switch setting is

enabled

To change switch settings on RMS9D series Trip
Units, refer to Chapter 5 to remove the Trip Unit
from the breaker. Push in the appropriate Enable or
Disable side of the switch to configure the accesso­ries, as shown in Figure 46, and carefully reinstall the
Trip Unit. Verify that the new switch settings are
correct by testing the breaker responses to
Undervoltage Release trips and Shunt trips.

enabled

disabled

.

.

.

Table 17. Accessory configuration switch settings, including

factory defaults.

Figure 46. Setting the accessory configuration switches.

24

MicroVersaTrip Plus™ and MicroVersaTrip PM™ Trip Units

Chapter 3. Metering Mode

3-1 Overview

The metering mode displays parameter values for
that part of the electrical system controlled by the
breaker’s MicroVersaTrip Plus or MicroVersaTrip
PM Trip Unit. Both currents and voltages are com­puted as true rms values. There is no loss of accuracy
even in the presence of high levels of harmonics. All
metering displays are updated once each second.
Accuracies and resolutions are described in Section
1-8 and Table 7.

All values except frequency are displayed to three
significant figures. For example, phase currents
might be displayed as 60.7

KA.

The Trip Unit metering displays are appropriate to
the actual configuration ordered. All MicroVersa­Trip Plus and MicroVersaTrip PM Trip Units

AMPS, 492 AMPS, or 1.22

include current metering. Two configurations of the
MicroVersaTrip PM Trip Units (with PM and M
suffixes in their catalog numbers) have the full
complement of metering displays.

The Trip Unit must be provided with control power
to display metered values. This can come from inter­nal battery power, from a MicroVersaTrip Portable
Power pack, from an external +24 Vdc power supply,
or by energizing the breaker to at least 20% of its
sensor load.

3-2 Metering Mode Operation

Metering mode is reached by pressing FUNCTION
until METER appears in the upper-right corner of the
display. Metering mode always begins with the phase
currents. The sequence in which the metered values
appear is illustrated in Figure 47.

Figure 47. Trip Unit metering mode function flow.

25

MicroVersaTrip Plus™ and MicroVersaTrip PM™ Trip Units

Chapter 3. Metering Mode

Figure 47. Trip Unit metering mode function flow (continued).

26

MicroVersaTrip Plus™ and MicroVersaTrip PM™ Trip Units

Chapter 3. Metering Mode

Current

The initial metering display is phase 1 line current,
as illustrated in Figure 48. Press
among the three phases. Current is displayed from 0
to 999 amperes and from 1.00 to a maximum of 999
kA. For current values less than 5% of the current
sensor rating, the displayed value is zero.

Figure 48. Trip Unit display for current metering.

VALUE to cycle

Voltage

The voltage displayed by this function depends on
how the Trip Unit was configured during Setup. If
the breaker was configured with phase-to-neutral
connections, the display shows individual phase volt­ages, as in Figure 49. If the breaker was configured
with phase-to-phase connections, the display shows
voltages between the phases, as in Figure 50. Press
VALUE to cycle through the three phase voltages.

Energy

This display, illustrated in Figure 51, shows the
aggregate energy flow through the breaker. The
value is displayed from 0 to 999 kWh, then automati­cally switches units to display 1.00 to 999 Mwh, and
then again to display 1.00 to 999 GWh. When 999
GWh is exceeded, the display switches back to 0
kWh. The largest negative energy value displayed is

−99 GWh.

Accumulated energy is stored in nonvolatile mem­ory. The value in the display can be reset through
the Trip Unit keypad. To reset the energy value,
hold down the
The displayed energy value will reset to zero.

Figure 51. Trip Unit display for aggregate energy.

VALUE key and press the SELECT key.

Total Real Power

The value displayed for total real power, illustrated
in Figure 52, represents the aggregate real power in
watts flowing through all three phases. The value is
displayed from 0 to 999 kW, then automatically
switches units to display 1.00 to 999 MW.

Figure 49. Trip Unit display for line-to-neutral voltages.

Figure 50. Trip Unit display for line-to-line voltages.

Figure 52. Trip Unit display for aggregate real power.

27

MicroVersaTrip Plus™ and MicroVersaTrip PM™ Trip Units

Chapter 3. Metering Mode

Total Apparent Power

The value displayed for total apparent power, as
illustrated in Figure 53, represents the aggregate
total apparent power in volt-amperes flowing
through all three phases. The value is displayed from
0 to 999 kVA, then automatically switches units to
display 1.00 to 999 MVA.

Figure 53. Trip Unit display for aggregate apparent power.

Power Demand

Power demand is the average of total power over the
selected interval (5, 10, …, 55, 60 minutes). This dis­play is updated every minute. The power demand
display is illustrated in Figure 54.

Frequency

This display, illustrated in Figure 55, shows the fre­quency of the line current. Either line voltage or
current must be present for this display to appear.

The frequency is calculated from the current and
voltage signals. If both are present, the voltage fre­quency is displayed. If neither are present, this dis­play does not appear.

The frequency is displayed in steps of 1 Hz.

Figure 55. Trip Unit display for frequency.

Figure 54. Trip Unit display for power demand.

Peak Power Demand

Peak power demand is stored in nonvolatile memory.
Every minute, the power demand is calculated and
compared against the stored peak power demand. If
the new power demand is greater than the stored
peak demand, the Trip Unit stores the new power
demand as the peak value. The display of peak
power demand is identical to the display illustrated
in Figure 54, except that the units segment (in this
case, MW) flashes.

Peak demand is stored in nonvolatile memory. The
value in the display can be reset through the Trip
Unit keypad. To reset the peak demand to the pres­ent demand, hold down the

SELECT key.

VALUE key and press the

28

MicroVersaTrip Plus™ and MicroVersaTrip PM™ Trip Units

Chapter 4. Status Mode

4-1 Overview

Trip Unit Status mode is selected by pressing the

FUNCTION key until STATUS appears on the display.

Status mode indicates the present status of the Trip
Unit and circuit breaker. It also displays information
about trip conditions and the trip history of the
breaker. Two categories of information can be
displayed: trip information and trip operations
counters.

Trip Information

Various trip information parameters are displayed
when an overcurrent trip or protective relay trip
occurs. Additionally, RMS9D series Trip Units pro­vide target indications if a breaker Undervoltage
Release or Shunt Trip accessory trip occurs.

The Status display indicates when a long-time, short­time, or ground-fault trip is imminent (breaker is in
pickup). Following a trip, the Trip Unit displays a
trip target to indicate the type of trip, the fault cur­rent magnitude at trip, and the phase of the fault
(where appropriate). For adjustable-instantaneous
trips, the Trip Unit displays the instantaneous func­tion setpoint rather than the actual current. Fault
magnitude is not displayed for high-range instanta­neous trips.

long-time, short-time, adjustable-instantaneous, and
ground-fault. The corresponding counter is incre­mented after any of these trips. A maximum of 256
trips can be counted for each type of fault, after
which the counter rolls over to zero.

4-2 Status Mode Operation

This section describes each of the Status mode dis­plays.

Normal Status Display

When the breaker is closed and its circuit energized,
the normal status display appears, as illustrated in
Figure 56. This display indicates that the Trip Unit is
not in long-time pickup and that all trip targets are
cleared.

Figure 56. Trip Unit display for normal status.

Trip information is stored in the Trip Unit memory
and displayed when Trip Unit power is returned or if
internal battery power is enabled. Trip information
is always available if Trip Unit power is maintained
following a fault.

The Status display records trip information only for
those options ordered with the Trip Unit. For exam­ple, only MicroVersaTrip PM Trip Units can be
equipped with protective relays and thus display
information about them.

RMS9D series Trip Units only display trip targets for
Undervoltage Release and Shunt Trip accessory trips
when those accessory modules are installed in the
Power Break® II breaker.

Trip Operations Counters

Trip operations counters record the total number of
overcurrent trips. Separate internal counters are
provided for each of the following types of trips:

Long-Time Overcurrent Pickup Display

When the long-time overcurrent function has
reached 95% of the Trip Unit’s long-time current
rating,
illustrated in Figure 57. During the transition from
95% to 100% of the set point, the frequency of flash­ing increases. When the set point is reached, but
before the time delay has expired, the flashing stops,
indicating that tripping is imminent.

29

xLT

, PICKUP begins to flash on the display, as

MicroVersaTrip Plus™ and MicroVersaTrip PM™ Trip Units

Chapter 4. Status Mode

Figure 57. Trip Unit status display for long-time overcurrent

pickup.

Trip Target and Fault Displays

When the breaker trips, information about the trip
can be displayed in Status mode. Figure 58 illustrates
a typical fault display following a trip.

Figure 58. Typical fault display following a breaker trip.

The

FAULT segment indicates that the breaker has

tripped because of an overcurrent condition or a
protective relay. This segment remains visible until it
is cleared, including displays in Setup and Meter
mode. This provides an indication that trip informa­tion is available, even if other screens are being dis­played. If the trip was caused by a protective relay,
the

FAULT segment flashes in Setup or Meter mode.

After an overcurrent trip, the
appropriate overcurrent target are displayed in all
modes, without blinking, until cleared.

FAULT segment and the

Figure 59. Trip Unit Status display for long-time overcurrent

trip.

Short-Time Overcurrent Fault Display

After a short-time trip, the status display appears as
in Figure 60. The information presented is similar to
that in the long-time overcurrent display, with the
short-circuit (

Figure 60. Trip Unit status display for short-time overcurrent

I>>) and short-time (ST) targets.

trip.

Instantaneous Fault Display

The status display for an adjustable instantaneous
trip is illustrated in Figure 61. Because of the fast
response of this function, the Trip Unit displays only
the threshold current for the fault, not the actual
fault current nor the phase on which the fault
occurred. For high-range instantaneous trips, the
threshold current is also not displayed, only the trip
target.

Long-Time Overcurrent Fault Display

After a long-time overcurrent trip, the trip informa­tion display contains the fault current magnitude at
trip, the phase on which the fault occurred, and the
overload (
display is illustrated in Figure 59.

I>) and long-time (LT) trip targets. This

Figure 61. Trip Unit status display for instantaneous

overcurrent trip.

30

MicroVersaTrip Plus™ and MicroVersaTrip PM™ Trip Units

Chapter 4. Status Mode

Ground-Fault Display

When a ground-fault trip occurs, the display illus­trated in Figure 62 appears. The fault current is dis­played in units of

xCT

, the breaker CT sensor rating.
Multiply the sensor rating of the breaker by the dis­played fault current multiplier to obtain the ground­fault current at trip.

Figure 62. Trip Unit status display for ground-fault trip.

Protective-Relay Fault Display

After a protective-relay trip, the display indicates

FAULT with a target for the type of relay that initiated

the trip. This is illustrated in Figure 63 for an
overvoltage trip. The targets for the five protective
relays are listed in Table 18.

Shunt Trip and Undervoltage Release Trip
Displays (RMS9D Series Trip Units Only)

When a Power Break ®II breaker trips due to the
Shunt Trip, Shunt Trip with Lockout, or
Undervoltage Release, the display indicates the trip
with a flashing target, as illustrated in Figure 64. The
indications

ST and UVR appear for Shunt Trip and

Undervoltage Release trips, respectively. Note that
the

FAULT segment does not display, since the trip

originated external to the breaker and may not
represent a true fault condition.

Figure 64. Trip Unit status display for Undervoltage Release

trip.

Clearing the Trip Information

Figure 63. Trip Unit status display for protective-relay trip.

CCCCooooddddeeeePPPPrrrrooootttteeeeccccttttiiiivvvveeee RRRReeeellllaaaayy

∆V Voltage unbalance

∆I Current unbalance

V< Undervoltage
V> Overvoltage

Power reversal

I
I

yy

Table 18. Trip Unit display targets for protective relays.

Since trip information is stored in nonvolatile mem­ory, the Trip Unit continues displaying the trip
information until it is manually cleared or a new trip
occurs. After the trip information has been recorded
or reviewed, it can be cleared with the keypad. With
the Trip Unit in Status mode, hold down the

VALUE

key and press the SELECT key. The trip information is
then cleared and the display reverts to

STATUS OK, as

in Figure 56.

Trip Operations Counter Display

Trip operations counters record the total number of
overcurrent trips. To review any of the trip opera­tions counters while in Status mode, press the
key until the desired count appears. Figure 65
illustrates a typical trip operations counter display.
This example indicates that there have been three
long-time trips on this breaker since the counter was
last reset.

SELECT

31

MicroVersaTrip Plus™ and MicroVersaTrip PM™ Trip Units

Chapter 4. Status Mode

Figure 65. Trip Unit status display for long-time overcurrent trip

counter.

Clearing the Trip Operations Counters

Since the trip operations counters are stored in non­volatile memory, the Trip Unit maintains the infor­mation indefinitely. To clear a particular counter,
first display the corresponding count, then hold
down the
trip counter is reset to zero.

VALUE key and press the SELECT key. The

32

MicroVersaTrip Plus™ and MicroVersaTrip PM™ Trip Units

Chapter 5. Maintenance and Trouble-Shooting

Rating plugs and MicroVersaTrip Plus and Micro­VersaTrip PM Trip Units are factory tested and nor­mally shipped installed in their breaker frame
assemblies or as part of a conversion kit. There is no
requirement for periodic maintenance of the Trip
Units.

within the Trip Units.

There are no user-serviceable components

5-1 Trip Unit Removal and
Replacement

Rejection pins are installed on the rear of all Trip
Units to prevent installation of an incorrect Trip
Unit into a breaker. Do not use excessive force when
installing a Trip Unit. Replacement of a Trip Unit
always requires repeating the setup procedures, as
described in Chapter 2.

Power Break® Insulated-Case Circuit
Breakers

Power Break circuit breakers are shipped from the
factory with their Trip Units installed. Removal is
only necessary for replacement. Refer to GEH-6303
for detailed instructions on replacing Trip Units in
Power Break circuit breakers.

WWWWAAAARRRRNNNNIIIINNNNGGGG::

the breaker off, disconnect it from all voltage
sources, and discharge the closing springs.

AAAAVVVVEEEERRRRTTTTIIIISSSSSSSSEEEEMMMMEEEENNNNTTTT::

procédure, mettre le disjoncteur en position OFF, le
déconnecter de toute tension d’alimentation, et
décharger les ressorts de fermeture.

Power Break II Insulated-Case Circuit
Breakers

Power Break II circuit breakers are shipped from the
factory with their Trip Units installed. Removal is
only necessary for replacement or to change the
accessory-configuration switches.

To remove the Trip Unit, perform the following
procedure:

::

Before beginning this procedure, turn

::

Avant de commencer cette

WWWWAAAARRRRNNNNIIIINNNNGGGG::

the breaker OFF, disconnect it from all voltage
sources, and discharge the closing springs, if they are
charged, by closing and then opening the breaker.

AAAAVVVVEEEERRRRTTTTIIIISSSSSSSSEEEEMMMMEEEENNNNTTTT::

procédure, mettre le disjoncteur en position OFF, le
déconnecter de toute tension d’alimentation, et
décharger les ressorts de fermeture.

1111....Loosen the four #8-32 screws on the breaker

trim-plate assembly and remove the trim plate.

2222....Loosen the four #10-32 screws at the corner of

the breaker cover. Remove the cover from the
breaker face.

3333....Pull the Trip Unit locking lever to the right,

then hold the Trip Unit near the battery cover
and lift it straight out of the breaker.

To reinstall the Trip Unit, perform the following
procedure:

1111....Pull the Trip Unit locking lever to the right.

While holding the lever, carefully align the
connector on the rear of the Trip Unit with the
connector in the breaker. Press down on the
Trip Unit while holding it near the battery
cover. When the Trip Unit is fully seated, slide
the locking lever back to the left.

2222....Reinstall the breaker top cover and tighten the

four #10-32 screws to 32 in-lbs.

3333....Replace the trim plate and tighten the four

#8-32 screws to 20 in-lbs.

::

Before beginning this procedure, turn

::

Avant de commencer cette

Type AKR Low-Voltage Power Circuit
Breakers

Type AKR circuit breakers are shipped from the fac­tory with their Trip Units installed. Removal is neces­sary only for replacement. Trip Units are separately
mounted on the breaker structure and are removed
by moving the Trip Unit removal bracket. When a
Trip Unit is replaced, the locking arm snaps back
into place to indicate proper engagement. Refer to
GEH-6303 for detailed instructions on replacing
Trip Units in in Type AKR circuit breakers.

33

MicroVersaTrip Plus™ and MicroVersaTrip PM™ Trip Units

Chapter 5. Maintenance and Trouble-Shooting

WWWWAAAARRRRNNNNIIIINNNNGGGG::

breakers before attempting to remove or replace the
Trip Unit. Because of the exposed location of the
Trip Unit, failure to observe this warning may result
in equipment damage or personal injury, including
death.

AAAATTTTTTTTEEEENNNNTTTTIIIIOOOONNNN::

AKR de toute tension avant d’enlever ou remplacer
le déclencheur. L’emplacement du déclencheur
étant proche de parties sous tension, le non respect
de cet avertissement peut entrainer des
endommagements du matériel, et des blessures
pouvant être mortelles.

::

Always de-energize Type AKR circuit

::

Deconneter le disjoncteur de type

5-2 Rating Plug Removal and
Replacement

CCCCAAAAUUUUTTTTIIIIOOOONNNN::

breaker is carrying current reduces the breaker’s
current-carrying capacity to approximately 25% of
the current sensor rating.

AAAATTTTTTTTEEEENNNNTTTTIIIIOOOONNNN::

et traversé par un courant, le niveau de protection
s’ajuste à approximativement 25% du calibre du
transformateur d’intensité.

Interchangeable rating plugs are removed with a
Rating Plug Extractor, Catalog No. TRTOOL.
(Suitable equivalents are commercially available as
“integrated circuit (DIP) extractors.”) Grasp the rat­ing plug tabs with the extractor and pull the plug out
as illustrated in Figure 66. Be sure to grab the tabs
and not the front cover of the rating plug, or the
plug may be damaged.

::

Removal of the rating plug while the

::

Si le calibreur est retiré le disjoncteur

Figure 66. Removing the interchangeable rating plug.

Rejection features are provided on all rating plugs to
prevent application mismatches. Never force a rating
plug into place. Refer to Chapter 1 to find the
appropriate rating plugs for each sensor rating and
breaker frame.

If a replacement rating plug has a different rating
than the plug that was removed, follow the appropri­ate setup procedure in Chapter 2 to enter the new
rating.

Do not attempt to use a rating plug from a Spectra
RMS™ breaker or a MicroVersaTrip RMS-9/MVT-4
function trip in a MicroVersaTrip Plus or Micro­VersaTrip PM Trip Unit.

5-3 Trouble-Shooting Guide

The following guide is provided for trouble-shooting
and isolating common problems. It does not cover
every possible condition. Contact the Customer
Support Center at 800-843-3742 if the problem is not
resolved by these procedures.

34

MicroVersaTrip Plus™ and MicroVersaTrip PM™ Trip Units

Chapter 5. Maintenance and Trouble-Shooting

SSSSyyyymmmmppppttttoooomm

1. The Trip Unit display is

2. The Trip Unit display

3. The Trip Unit display

4. The trip indication

5. Unit does not com-

mm

blank.

flashes.

flashes ERR.

target will not clear.

municate with the
Monitor, POWER
LEADER Distribution
Software, or FPU.

PPPPoooossssssssiiiibbbblllleeee CCCCaaaauuuussssee

Line current is below 20% of
the breaker sensor rating
(MicroVersaTrip Plus).

External +24 Vdc is absent
(MicroVersaTrip PM).

Can occur on Plus-style Trip
Units when the load current
fluctuates near 20% of the
breaker sensor rating.

The built-in self test has
detected an error.

Trip Unit is not in Status
mode.

The commnet wires are
shorted or improperly
connected.

FPU version is lower than 2.0.

The Trip Unit address is
incorrect.

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At least 20% of the current sensor rating,
be flowing through the breaker to activate the display.
If not, power the Trip Unit with the internal battery
or the Portable Power Pack. The battery power supply
is disabled when any current is sensed through the
current sensors.

Check that the control power supply is present and
operational.

Power the Trip Unit with the internal battery or the
Portable Power Pack.

Replace the Trip Unit.

Press FUNCTION until STATUS is displayed. Hold
down the VALUE key and press the SELECT key to
clear the target.

Locate and repair the short or the incorrect con­nection.

Update the FPU to version 2.0 or higher.

Check that the address assigned to the Trip Unit, as
in Chapter 2, agrees with the address at the host.

nn

xCT

, must

6. Current readings are
incorrect.

7. Voltage readings are
incorrect.

8. The display is blank or
the Low Battery symbol
appears when the

BATTERY key is pressed.

The rating plug value was
defined incorrectly.

The potential transformer
(PT) primary voltage was
defined incorrectly.

The PT connection was
defined incorrectly.

The battery is discharged.

The battery was stored too
long with no power applied to
the Trip Unit

35

Read the X value from the rating plug name plate
and enter this as the
current set point procedure in Chapter 2.

xIn

value with the rating plug

Do not

enter the sensor rating, S.

Read the PT primary rating from the PT name plate
and enter this value with the PT primary voltage
procedure in Chapter 2.

Follow the PT connection procedure in Chapter 2 to
enter Ph-N for a wye-connected PT primary or Ph-Ph
for a delta-connected PT.

Replace the battery.

Power the Trip Unit with external power or by
energizing the breaker for several days to freshen the
battery.

MicroVersaTrip Plus™ and MicroVersaTrip PM™ Trip Units

Appendix 1

Catalog Numbers for RMS9C Trip
Units in AKR Circuit Breakers

The following table contains the catalog number
options for AKR circuit breakers, with an illustration
of a valid number and the options that each part of
the number refers to.

AAAA 22

22

00004444 LLLL SSSS IIII GGGG ZZZZ1111 PPPP MMMM RR

RR

CCCCooooddddeeeeDDDDeeeessssccccrrrriiiippppttttiiiioooonn

A AKR BBBBrrrreeeeaaaakkkkeeeerrrr TTTTyyyyppppee

225–2000 A maximum CT

2

3200 A maximum CT

3

4000 A maximum CT

4

150 A

01

225 A

03

400 A

04

600 A

06

800 A

08

1600 A

16

2000 A

20

3000 A

30

3200 A

32

4000 A

40

Long-time (standard)

L

Short-time

S

High instantaneous

H

Instantaneous

I

Fixed high instantaneous

K

Ground fault

G

Defeatable ground fault (not UL listed)

GD

W curve

W

Ground-fault zone-selective interlock

Z1

Ground-fault and short-time ZSI

Z2

Switchable instantaneous short time and ground fault

X

PMRelaying and communication

Metering and communication

R Replacement trip unit RRRReeeeppppllllaaaacccceeeemmmmeeeennnntt

nn

FFFFuuuunnnnccccttttiiiioooonn

BBBBrrrreeeeaaaakkkkeeeerrrr FFFFrrrraaaammmmee
((((mmmmaaaaxxxx CCCCTTTT))

IIIInnnnssssttttaaaalllllllleeeedddd CCCCTT

OOOOvvvveeeerrrrccccuuuurrrrrrrreeeennnntttt PPPPrrrrooootttteeeeccccttttiiiioooonn

GGGGrrrroooouuuunnnndddd----FFFFaaaauuuulllltt
PPPPrrrrooootttteeeeccccttttiiiioooonn

OOOOppppttttiiiioooonnnnaaaallll FFFFuuuunnnnccccttttiiiioooonnnnss

CCCCoooommmmmmmmuuuunnnniiiiccccaaaattttiiiioooonnnn,,
MMMMeeeetttteeeerrrriiiinnnngggg,,,, &&&& RRRReeeellllaaaayyyyiiiinnnngg

nn

ee

ee

))

TT

nn

tt

nn

ss

,,

gg

tt

36

MicroVersaTrip Plus™ and MicroVersaTrip PM™ Trip Units

Catalog Numbers for RMS9C Trip
Units in Power Break

The following table contains the catalog number
options for Power Break circuit breakers, with an
illustration of a valid number and the options that
each part of the number refers to.

® Circuit Breakers

Appendix 2

CCCC 22

22

00008888 LLLL SSSS IIII GGGG ZZZZ1111 PPPP MMMM RR

RR

CCCCooooddddeeeeDDDDeeeessssccccrrrriiiippppttttiiiioooonn

C Power Break BBBBrrrreeeeaaaakkkkeeeerrrr TTTTyyyyppppee

800–2000 A maximum CT

2

3000 A maximum CT

3

4000 A maximum CT

4

200 A

02

400 A

04

800 A

08

1000 A

10

1600 A

16

2000 A

20

2500 A

25

3000 A

30

4000 A

40

Long-time (standard)

L

Short-time

S

High instantaneous

H

Instantaneous

I

GGDGround fault

Defeatable ground fault (not UL listed)

Z1Z2Ground-fault zone-selective interlock

Ground-fault and short-time ZSI

PMRelaying and communication

Metering and communication

R Replacement trip unit RRRReeeeppppllllaaaacccceeeemmmmeeeennnntt

nn

FFFFuuuunnnnccccttttiiiioooonn

BBBBrrrreeeeaaaakkkkeeeerrrr FFFFrrrraaaammmmee
((((mmmmaaaaxxxx CCCCTTTT))

IIIInnnnssssttttaaaalllllllleeeedddd CCCCTT

OOOOvvvveeeerrrrccccuuuurrrrrrrreeeennnntttt PPPPrrrrooootttteeeeccccttttiiiioooonn

GGGGrrrroooouuuunnnndddd----FFFFaaaauuuulllltt
PPPPrrrrooootttteeeeccccttttiiiioooonn

OOOOppppttttiiiioooonnnnaaaallll FFFFuuuunnnnccccttttiiiioooonnnnss

CCCCoooommmmmmmmuuuunnnniiiiccccaaaattttiiiioooonnnn,,
MMMMeeeetttteeeerrrriiiinnnngggg,,,, &&&& RRRReeeellllaaaayyyyiiiinnnngg

nn

ee

ee

))

TT

nn

tt

nn

ss

,,

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tt

37

MicroVersaTrip Plus™ and MicroVersaTrip PM™ Trip Units

Appendix 3

Catalog Numbers for RMS9D Trip
Units in Power Break
Breakers

The following table contains the catalog number
options for Power Break II circuit breakers, with an
illustration of a valid number and the options that
each part of the number refers to.

® II Circuit

BBBB 22

22

00008888 LLLL SSSS IIII GGGG ZZZZ1111 PPPP MMMM RR

RR

CCCCooooddddeeeeDDDDeeeessssccccrrrriiiippppttttiiiioooonn

B Power Break II BBBBrrrreeeeaaaakkkkeeeerrrr TTTTyyyyppppee

2000 A maximum CT

2

3000/3200 A maximum CT

3

4000 A maximum CT

4

200 A

02

400 A

04

800 A

08

1000 A

10

1600 A

16

2000 A

20

2500 A

25

3000 A

30

4000 A

40

Long-time (standard)

L

Short-time

S

High instantaneous

H

Instantaneous

I

GGDGround fault

Defeatable ground fault (not UL listed)

Z1Z2Ground-fault zone-selective interlock

Ground-fault and short-time ZSI

PMRelaying and communication

Metering and communication

R Replacement trip unit RRRReeeeppppllllaaaacccceeeemmmmeeeennnntt

nn

FFFFuuuunnnnccccttttiiiioooonn

BBBBrrrreeeeaaaakkkkeeeerrrr FFFFrrrraaaammmmee
((((mmmmaaaaxxxx CCCCTTTT))

IIIInnnnssssttttaaaalllllllleeeedddd CCCCTT

OOOOvvvveeeerrrrccccuuuurrrrrrrreeeennnntttt PPPPrrrrooootttteeeeccccttttiiiioooonn

GGGGrrrroooouuuunnnndddd----FFFFaaaauuuulllltt
PPPPrrrrooootttteeeeccccttttiiiioooonn

OOOOppppttttiiiioooonnnnaaaallll FFFFuuuunnnnccccttttiiiioooonnnnss

CCCCoooommmmmmmmuuuunnnniiiiccccaaaattttiiiioooonnnn,,
MMMMeeeetttteeeerrrriiiinnnngggg,,,, &&&& RRRReeeellllaaaayyyyiiiinnnngg

nn

ee

ee

))

TT

nn

tt

nn

ss

,,

gg

tt

38

MicroVersaTrip Plus™ and MicroVersaTrip PM™ Trip Units

Trip Unit Battery Suppliers

CCCCaaaattttaaaalllloooogg

SSSSuuuupppppppplllliiiieeeerr

Wilson Greatbatch Ltd.
Electrochem Lithium Batteries
10,000 Wehrle Drive
Clarence, NY
(716) 759–5428

Contact the supplier for the nearest distributor.

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3B24–XA

Appendix 4

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39

g

General Electric Company
41 Woodford Ave., Plainville, CT 06062

GEH6273 R06 1299 © 1999 General Electric Company

GE Electrical Distribution & Control