Protection Relays & Controls
© 2015 Littelfuse Protection Relays & Controls
Accessories
Relay Testers
Description
The SE-400 is a ground-fault-relay test unit designed to test
current pickup level, time delay and coordination of ground-
fault 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.
SE-400 SERIES
Ground-Fault-Relay Test Unit
ORDERING NUMBER CONTROL POWER
SE-400 120 Vac
Ordering Information
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 0.5-9.9 A
Output Duration Settings 0.1-9.9 s or continuous
Output Voltage 5.0 Vac maximum
Conformally Coated Standard feature
Warranty 5 Year
Mounting Surface, Panel
Simplified Circuit Diagram
FEATURES BENEFITS
Adjustable Current
Setpoint
Current range is 0.5 to 9.9 A
Adjustable Time
Duration Setpoint
Duration range is 0.1 to 9.9 s, or continuous
output
Small Form Factor Lightweight and compact for portability
Remote Test Input
Allows test to be initiated from another
location
Features & Benefits
Rev: 4-A-050313
Based on Manual Rev 1
Rev: 4-A-081515
Based on Manual Rev: 1-A-072115
