Littelfuse SE-400 User Manual

Accessories

Relay Testers

SE-400 SERIES

Ground-Fault-Relay Test Unit

Description

The SE-400 is a ground-fault-relay test unit designed to test
current pickup level, time delay and coordination of ground­fault protection.

The tester injects current through the window of installed
ground-fault current transformers to verify the operation of
ground-fault monitors and relays.

It is used on substations, motor control centers (MCCs),
central distribution panels, switchboards, and test benches to
verify relay operation.

The SE-400 tests the entire ground-fault circuit including
current transformers, wiring, ground-fault relay and the
operation of the interrupting device. It is recommended to
test every relay and its current interrupting device annually.

Simplified Circuit Diagram

CT

NGR

SENSING
RESISTOR

NGR
MONITOR

L1

L2

L1

L2

L1

L2

CT

GROUND-FAULT

MONITOR

SE-400 SERIES

(Ground-Fault
Relay Test Unit)

Features & Benefits

FEATURES BENEFITS

Adjustable Current
Setpoint

Adjustable Time
Duration Setpoint

Small Form Factor Lightweight and compact for portability

Remote Test Input

Current range is 0.5 to 9.9 A

Duration range is 0.1 to 9.9 s, or continuous
output

Allows test to be initiated from another
location

Ordering Information

ORDERING NUMBER CONTROL POWER

SE-400 120 Vac

Specifications

Input Voltage 84-134 Vac, 50/60 Hz, 80 VA
Dimensions H 219 mm (8.6”);

W 99 mm (3.9”);

D 143 mm (5.6”)
Output Current Settings 0.5
Output Duration Settings 0.1
Output Voltage 5.0 Vac maximum
Conformally Coated Standard feature
Warranty 5 Year
Mounting Surface, Panel

-9.9 A

-9.9 s or continuous

© May 2012 Littelfuse Protection Relays & Controls www.littelfuse.com/relayscontrols