GE Industrial Solutions AK-50, AKU-50, AKS-50, AKT-50, AK-75 User Manual
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DEH–40028 Installation Instructions
ProTrip™ Conversion Kits
For GE Types AK-50, AKU-50, AKS-50,
AKT-50, AK-75, and AK-100 LowVoltage Power Circuit Breakers
INTRODUCTION
GE Conversion Kits are designed for upgrading existing
GE low-voltage power circuit breakers, rather than
replacing the entire breaker. The Conversion Kits include
ProTrip™ Trip Units, the latest technological advance in
GE trip systems.
ProTrip Conversion Kits are designed and tested to
conform to ANSI Standard C37.59, allowing the retrofitter
to properly install the kit and acceptance test the breaker.
This publication covers installation of ProTrip Conversion
Kits on GE types AK-50, AKU-50, AKS-50, AKT-50, AK75, and AK-100 low-voltage power circuit breakers. Each
Conversion Kit contains all the components needed to
convert from an existing GE type EC trip system.
TABLE OF CONTENTS
SECTION 1. GENERAL INFORMATION............................................................................................................4
SECTION 2. BEFORE INSTALLATION..............................................................................................................4
SECTION 3. FRONT FRAME BREAKER CONVERSION
Relocating and Remounting the W and X Relays ..................................................................................5
Installing the Flux Shifter Assembly........................................................................................................6
Breakers with EC or Power Sensor Trip Systems.....................................................................6
Breakers with a Side Bracket.....................................................................................................7
AKU-50 Breakers Only...............................................................................................................7
Breakers with ECS or SST Trip Systems ..................................................................................8
Installing the Trip Paddle ........................................................................................................................8
Adjusting the Flux Shifter........................................................................................................................8
Installing the Trip Unit Mounting Bracket................................................................................................9
EC or Power Sensor Trip System..............................................................................................9
ECS or SST Trip System ...........................................................................................................9
SECTION 4. BACK FRAME CONVERSION
Crossbar Modification ...........................................................................................................................10
Removing the Existing Trip Devices.....................................................................................................11
AK-50 & AKS-50 Breakers with EC or Power Sensor Trip Systems.......................................11
AK-50 & AKS-50 Breakers with SST Trip Systems.................................................................11
AK-75 & AK-100 Breakers with EC or Power Sensor Trip Systems .......................................11
AK-75 & AK-100 Breakers with SST Trip Systems .................................................................11
Installing the Phase Sensors ................................................................................................................12
AK-50 & AKS-50 Breakers.......................................................................................................12
AK-75 & AK-100 Breakers.......................................................................................................13
SECTION 5. INSTALLING THE TRIP UNIT
Configuring the Trip Unit.......................................................................................................................14
SECTION 6 FOUR-WIRE GROUND FAULT OPTION
Installing the Fourth-Wire Disconnect...................................................................................................15
AK-50 & AKS-50 Stationary Breakers .....................................................................................15
AK-50 & AKS-50 Draw-Out Breakers......................................................................................16
AK-75 & AK-100 Draw-Out Breakers.......................................................................................16
Installing the Neutral Sensor.................................................................................................................18
SECTION 7. EQUIPMENT CONVERSION
Installing Mounting Brackets.................................................................................................................20
SECTION 8. TESTING AND TROUBLE-SHOOTING
Testing ..................................................................................................................................................22
Trouble-Shooting...................................................................................................................................22
Nuisance Tripping on Ground Fault-Equipped Breakers.........................................................22
APPENDIX – DRILL TEMPLATES
Appendix 1. Drill Template for Flux Shifter Mounting ...........................................................................25
Appendix 2. Drill Template for Trip Unit Mounting................................................................................27
Appendix 3. Drill Template for Flux Shifter Mounting ...........................................................................27
2
LIST OF FIGURES
1. Relocation and remounting of the W and X relays...........................................................................................5
2. New X and W relay mounting brackets............................................................................................................ 5
3. Flux shifter assembly........................................................................................................................................6
4. Pattern for flux shifter mounting holes in the side frame..................................................................................6
5. Flux shifter assembly mounted to the side frame. ...........................................................................................6
6. Location of new hole in the flux shifter base....................................................................................................7
7. Locations of new holes for mounting the OFLO terminal block.......................................................................7
8. Existing trip paddles to be removed.................................................................................................................8
9. Installing the new trip paddle............................................................................................................................8
10. Adjusting the flux shifter................................................................................................................................... 8
11. Mounting hole drill pattern for the trip unit mounting plate............................................................................... 9
12. Trip unit mounting plate attached to the breaker front channel.......................................................................9
13. Trip unit mounting bracket attached to the mounting plate..............................................................................9
14. Actuator bracket attached to the left pole link................................................................................................10
15. Drill pattern for actuator bracket mounting holes. .......................................................................................... 10
16. Existing EC trip devices before removal........................................................................................................ 11
17. Removal of EC trip devices............................................................................................................................ 11
18. Parts provided for CT installation per pole.....................................................................................................12
19. CT post mounted in the breaker back frame..................................................................................................12
20. CT installation completed...............................................................................................................................12
21. Phase sensor installation on AK-75 & AK-100 breakers...............................................................................13
22. Attaching the trip unit to the mounting plate...................................................................................................14
23. Trip unit mounted on the breaker...................................................................................................................14
24. Fourth-wire terminal board installation on AK-50 & AKS-50 stationary breakers.......................................... 15
25. Fourth-wire disconnect installed on AK-50 & AKS-50 draw-out breakers.....................................................16
26. Fourth-wire disconnect assembly for AKD-5 or AKD-6 equipment................................................................16
27. Fourth-wire disconnect assembly for AKD equipment...................................................................................16
28. K-75 & AK-100 back frame conversion..........................................................................................................17
29. Outline of the neutral sensor for AK-50 breakers........................................................................................... 18
30. Outline of the neutral sensor for AK-75 and AK-100 breakers ......................................................................19
31. AK-50 & AKS-50 fourth-wire disconnect for AKD. .........................................................................................20
32. AK-75 & AK-100 fourth-wire disconnect for AKD-5 & AKD-6. .......................................................................20
33. AK-100 fourth-wire disconnect for AKD. ........................................................................................................20
34. AK-50 & AKS-50 fourth-wire disconnect for AKD. .........................................................................................21
35. Fourth-wire disconnect for AKD-5 & AKD-6...................................................................................................21
36. Cabling diagram for ProTrip™ trip units with ground fault on four-wire loads...............................................24
3
SECTION 1. GENERAL INFORMATION
SECTION 2. BEFORE INSTALLATION
GE Conversion Kit installation is straightforward, but
does require careful workmanship and attention to these
instructions. Familiarity with the breaker is highly
desirable. The general approach is to first remove the
existing trip devices from the breaker, then install the
ProTrip components. Following this procedure, the
converted breaker is performance tested before it is
returned to service.
The majority of trip unit kit installations do not require any
customized assembly work. However, some conversions
may involve unusual mounting conditions or accessory
combinations that require minor modifications and/or
relocation of components. In most instances, this
supplementary work can be done on site.
In preparation for the conversion, the installer should
verify that the appropriate current sensors and trip unit
have been furnished. Whenever a ProTrip kit is installed
on a breaker with a four-wire system, an associated
neutral sensor (CT) is required for separate mounting in
the equipment. Ensure that retrofitted breakers are
applied within their short-circuit ratings.
Note that all ProTrip trip units supplied with conversion
kits are equipped with long-time, short-time,
instantaneous, and defeatable ground fault (LSIGX) trip
functions. The installer should be aware of how these
functions will affect his application before installing the
conversion kit.
As a service-related consideration, the installation of a
ProTrip kit provides an excellent opportunity to perform
normal maintenance on the breaker, particularly when
the front and back frames are separated. Such
procedures are described in the installation and
maintenance manuals supplied with the breaker and
equipment.
Before starting any work, turn off and lock out all power
sources leading to the breaker, both primary and
secondary. Remove the breaker to a clean, well-lighted
work area.
WARNING: Low-voltage power circuit breakers use
high-speed, stored-energy spring operating
mechanisms. The breakers and their enclosures
contain interlocks and safety features intended to
provide safe, proper operating sequences. For
maximum personnel protection during installation,
operation, and maintenance of these breakers, the
following procedures must be followed. Failure to follow
these procedures may result in personal injury or
property damage.
• Only qualified persons, as defined in the National
Electrical Code, who are familiar with the installation
and maintenance of low-voltage power circuit
breakers and switchgear assemblies, should
perform any work on these breakers.
• Completely read and understand all instructions
before attempting any breaker installation,
operation, maintenance, or modification.
• Turn off and lock out the power source feeding the
breaker before attempting any installation,
maintenance, or modification. Follow all lock-out
and tag-out rules of the National Electrical Code and
all other applicable codes.
• Do not work on a closed breaker or a breaker with
the closing springs charged. Trip an OPEN breaker
and be sure the stored-energy springs are
discharged, thus removing the possibility that the
breaker may trip OPEN or the closing springs
discharge and cause injury.
• Trip the breaker OPEN, then remove the breaker to
a well-lighted work area before beginning work.
• Do not perform any maintenance that includes
breaker charging, closing, tripping, or any other
function that could cause significant movement of a
draw-out breaker while it is on the draw-out
extension rails.
• Do not leave the breaker in an intermediate position
in the switchgear compartment. Always leave it in
the CONNECTED, TEST, or DISCONNECTED
position. Failure to do so could lead to improper
positioning of the breaker and flashback.
4
SECTION 3. FRONT FRAME
BREAKER CONVERSION
Front frame conversion consists of the following steps:
1. Separation of the front and back breaker frames for
AK-50, AKU-50, AKS-50, and AKT-50 breakers.
(Frame separation is not necessary for AK-75 and
AK-100 breakers.) Refer to the appropriate
installation and maintenance manuals supplied with
the breakers and equipment for instructions on frame
separation. Copies of these publications may be
obtained from your local GE sales office.
2. Relocation and remounting the W and X relays on
AK-50, AK-75, and AK-100 electrically operated
breakers with EC trip devices.
3. Installation of the flux shifter assembly and trip
paddle.
4. Installation of the trip unit mounting bracket.
5. Installation of the trip unit wiring harness.
Relocating and Remounting the W and X
Relays
This step is necessary on electrically operated breakers
with EC trip devices. Figure 1 illustrates this process.
Figure 2 shows the new mounting brackets supplied with
the kit.
1. Remove the W relay and install the mounting bracket
supplied with the conversion kit to the upper left side
of the frame
2. Remove the X relay and its mounting bracket. Use
the new bracket supplied with the conversion kit to
remount the X relay in its existing position.
Figure 1. Relocation and remounting of the W and X
relays.
W Relay
X Relay
Figure 2. New X and W relay mounting brackets.
5
Installing the Flux Shifter Assembly
The installation procedure for the flux shifter assembly,
illustrated in Figure 3, varies depending on the type of
breaker and existing trip device. In some cases,
mounting holes must be added, terminal blocks
relocated, or breaker side rails removed.
Breakers with EC or Power Sensor Trip Systems
1. Drill the flux shifter mounting holes in the left side of
the breaker frame. The mounting hole pattern is
illustrated in Figure 4. A full-size template is provided
in the Appendix.
2. Mount the new flux shifter to the inside of the side
frame with the three screws, lock washers, flat
washers, and nuts supplied, as shown in Figure 5.
Insert the screws from the outside of the side frame.
Figure 4. Pattern for flux shifter mounting holes in the
side frame.
Figure 3. Flux shifter assembly.
Mounting
Screws
Flux Shifter
Assembly
Figure 5. Flux shifter assembly mounted to the side
frame.
6
Breakers with a Side Bracket
1. Drill a 3/4” diameter hole into the flux shifter
assembly mounting base to provide the necessary
clearance for the bracket. The location of the new
hole is shown in Figure 6.
2. Remove the side bracket from the frame and drill the
holes according to the pattern in Figure 4. A full-size
template is provided in the Appendix. After the holes
are drilled, return the side bracket to its original
location.
3. Mount the new flux shifter to the inside of the side
frame with the three screws, lock washers, flat
washers, and nuts supplied, as shown in Figure 5.
The upper two screws are inserted from the outside
of the frame, while the lower screw must be inserted
from the inside.
AKU-50 Breakers Only
For easier installation of the new flux shifter assembly on
AKU-50 breakers, the open-fuse lockout (OFLO) may be
removed from the breaker.
1. Remove the three bolts attaching the OFLO to the
base of the breaker.
2. The OFLO terminal block must be relocated on the
upper left side of the breaker. Some parts and tool,
not provided with the kit, are necessary for this task:
• Six strips of 14 AWG wire
• Wire splice
• 12 butt splices
• Wire labels
• Drill and size F bit
5
/16-18 tap
•
• Flathead screw driver
• Two
3. Drill and tap two holes for the
5
/16-18 bolts and lock washers
5
/16-18 bolts. Figure 7
shows the hole locations.
4. Remove the three bolts securing the OFLO to the
breaker and lift off the OFLO device.
5. Remove the wires that connect the OFLO device to
the terminal block.
6. Cut the wires that connect to the coils where they join
and label the wires. Attach butt splices to all twelve
open ends.
7. Connect the strands of wire to the OFLO. Mount the
terminal block in its new location. DO NOT complete
the wire connections until the flux shifter is installed.
8. Install the new flux shifter assembly as described
above and shown in Figure 5.
9. Connect the cables attached to the terminal block
and tie them together.
Figure 6. Location of new hole in the flux shifter base.
Figure 7. Locations of new holes for mounting the OFLO
terminal block.
7
Breakers with ECS or SST Trip Systems
1. Remove the ECS or SST trip unit.
2. Remove the existing flux shifter device and the trip
unit control harness.
3. Install the new flux shifter assembly as described
above and shown in Figure 5.
Installing the Trip Paddle
For breakers equipped with an ECS or SST trip system,
the existing trip paddle is used with the new flux shifter.
For all other breakers, the existing trip paddles must be
removed and the new trip paddle installed as follows:
1. Remove and discard the three trip paddles on the trip
actuator bar, as shown in Figure 8.
2. Assemble the trip paddle and the threaded back
plate by inserting two of the 10-32 x
lock washers provided along the top edge.
3. Slip the trip paddle over the trip actuator bar
approximately one inch from the side frame, as
shown in Figure 9. Insert the remaining 10-32 x
screw and tighten the other screws to secure the trip
paddle in place.
3
/4" screws and
3
/4"
Figure 8. Existing trip paddles to be removed.
Adjusting the Flux Shifter
After the flux shifter and trip paddle are installed and the
breaker frames are reassembled, the following
adjustments must be made.
1. With the breaker OPEN and the mechanism charged,
set the gap between the trip paddle and the end of
the flux shifter rod at 0.10 inch, as shown in Figure
10. Use a 0.10-inch diameter rod. Set the adjuster
end of the trip rod and lock it in place with the jam
nut. Note that removal of the buffer stud will make
the trip paddle easier to install and adjust.
2. As the crossbar travels between the breaker
CLOSED and OPEN positions, the tang of the
actuator bracket must clear the buffer stud. If there is
insufficient clearance, loosen the two mounting
screws and rotate the bracket clockwise to take up
mounting hole slack. Retighten the screws.
3. Optional Test – The flux shifter may be tested by
closing the breaker and applying a 9 Vdc power
source to the flux shifter leads (the red wire is positive). The breaker should trip.
Figure 9. Installing the new trip paddle.
Figure 10. Adjusting the flux shifter.
8
Installing the Trip Unit Mounting Bracket
The new ProTrip trip unit mounts to the left side of the
front channel. A mounting bracket is shock--mounted to a
plate that is assembled to the front channel.
EC or Power Sensor Trip System
1. The holes for the new mounting plate may have to be
added to the front channel. The drill pattern is shown
in Figure 11, with a full-size template in the
Appendix. Tap the holes for
2. Attach the new mounting plate, as shown in Figure
12, with two short
1
/4-20 screws and lock washers on
the top and the single long
washer on the bottom. Be sure to insert the spacer
between the mounting plate and the breaker channel,
as shown.
3. Attach the trip unit mounting bracket to the plate with
two screws, lock washers, and flat washers, as
shown in Figure 13.
1
/4-20 screws.
1
/4-20 screw and lock
ECS or SST Trip System
Remove the existing mounting plate and bracket. Install
the new mounting plate and bracket, using the holes
closest to the front of the breaker, as described in steps 2
and 3 above.
If the manual indicator assembly busing on AK-50
manual breakers interferes with the mounting bracket
installation, then the bracket must be modified. Cut off a
3/4 x 11/2 inch section from the right front of the plate to
provide clearance.
Figure 12. Trip unit mounting plate attached to the
breaker front channel.
Figure 13. Trip unit mounting bracket attached to the
mounting plate.
Figure 11. Mounting hole drill pattern for the trip unit
mounting plate.
9
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