Littelfuse SE-701 User Manual

Protection Relays & Controls

Ground-Fault Protection–Grounded Systems

SE-701 SERIES (PGR-5701)

Ground-Fault Monitor

Simplified Circuit Diagram

A

CT

A

GROUNDED

SUPPLY

B

C

Description

The SE-701 is a microprocessor-based ground-fault relay for resistance­and solidly-grounded systems. In addition to common systems, it is
uniquely suited for use on systems with significant harmonic content.
The SE-701 can provide main-plant protection, feeder-level protection,
or individual-load protection. Proper current transformer selection
provides the desired pickup range. The output contacts can be
connected for use in protective tripping circuits or in alarm indication
circuits. The analog output can be used with a PLC or a meter.

Features & Benefits

FEATURES BENEFITS

Adjustable pickup
(1-99%)

Adjustable time delay
(50 ms - 2.5 s)

Output contacts

Analog output
(0 - 5 V)

CT-Loop monitoring Alarms when CT is not connected
Selectable DFT or peak

detection filtering
Harmonic filtering Eliminates nuisance tripping
Non-volatile trip

memory
Microprocessor based No calibration required, saves on maintenance cost

Universal power supply

Trip setting based on input CT primary, allows use with
any CT. Minimum 50 mA with EFCT Series.

Adjustable trip delay allows quick protection and system
coordination

Form A and Form B ground-fault output contacts for
operation of separate annunciation and trip circuits

Allows for connecting an optional meter (PGA-0500) or a
control system

Compatible with variable-speed drives

Retains trip state while de-energized to simplify
troubleshooting

Allows operation in application where one side of PT is
faulted, provides flexibility for numerous applications

SE-701 SERIES

L1

L2

(Ground-Fault Monitor)

Ordering Information

ORDERING NUMBER CONTROL POWER

SE-701-OU 120/240 Vac/ Vdc

SE-701-OD 12/24 Vdc

SE-701-OT 48 Vdc

SE-701-O3 24 Vac

ACCESSORIES REQUIREMENT

Current Transformer Required

PGA-0500 Optional

PMA-55, PMA-60 Optional

SE-EFVC Voltage Clamp Optional

Note: For o ptional conformal coati ng pleas e consult factory.

Accessories

A

B

Ground-Fault Current Transformer

Required current transformer model depends on
application. We offer a variety of sensitive CTs with
5- and 30-A primaries.

PGA-0500 Analog % Current Meter

Optional panel-mounted analog meter displays
ground-fault current as a percentage of the CT
primary rating.

Specifications

IEEE Device Numbers Ground fault (50G/N, 51G/N)
Input Voltage See ordering information
Dimensions
Trip Level Settings 1-99% CT-Primary Rating
Trip Time Settings 0.05 -2.5 s
Contact Operating Mode Selectable fail-safe or non-fail-safe
Harmonic Filtering Standard feature
Test Button Standard feature
Reset Button Standard feature
CT-Loop Monitoring Standard feature
Output Contacts Isolated Form A and Form B
Approvals

CE (European Union), C-Tick (Australian)

Analog Output 0-5 V
Conformally coated Consult factory
Warranty 5 years
Mounting DIN, Surface (standard)

Panel (with PMA-55 or PMA-60 adapter)

H 75 mm (3.0"); W 55 mm (2.2"); D 115 mm (4.5")

CSA certified

, UL Listed (E340889),

© 2013 Littelfuse Protection Relays & Controls
Littelfuse.com/se-701

Based on Manual Rev 10-A-041213

Rev: 4-A-050213