Littelfuse SE-502 User Manual
Protection Relays & Controls
Ground-Fault Ground-Continuity Detection
SE-502 SERIES
Ground-Fault Ground-Continuity Detector
Simplified Circuit Diagram
120/208 V
Generator
A
B
G
C
120-V
Loads
Description
The SE-502 Ground-Fault Ground-Continuity Detector provides
Class-A GFCI trip level and trip times for personnel protection.
As little as 5 mA of ground-fault current can be detected, and the
internal neutral-grounding resistor limits the maximum ground-fault
current to 100 mA. The SE-502 can be used on both energized and
de-energized systems, and will continuously monitor neutral
continuity, detect a load-side grounded neutral, and is capable of
ground proving. These features make the SE-502 ideal for use with
120/208 V portable generators and in heat-trace applications.
Features & Benefits
FEATURES BENEFITS
Sensitive 5 mA groundfault detection
Internal neutralgrounding resistor
Neutral-to-ground
connection monitoring
On- and off-line
monitoring
Output contacts
Can be used with an appropriate breaker to
provide Class A GFCI people protection
Limits maximum ground-fault current to 100 mA,
creates a safer system and elminates arc-flash
ground-fault hazards
Can detect a hazardous ungrounded condition and
trip or alarm
Can detect a ground fault when the system is
energized or de-energized
Two Form C output contacts for alarming or
tripping purposes
N
SE-502 SERIES
(Ground-Fault
Ground-Continuity Detector)
Ordering Information
ORDERING NUMBER CONTROL POWER
SE-502-01 120 Vac
Specifications
IEEE Device Numbers Ground (Earth) Detector Relay (64)
Lockout Relay (86)
Open-Neutral Detector Relay (95)
Input Voltage 120 Vac, 50/60 Hz
Dimensions
Trip Level Settings 5 ± 0.9 mA
Trip Time Settings Class A GFCI to 25 ms maximum
Contact Operating Mode Trip: fail-safe or non-fail-safe
Alarm: fail-safe
Reset Button Standard feature plus remote input
Output Contacts Two Form C
Warranty 5 years
Mounting DIN, Surface
H 75 mm (3.0")
W 100 mm (4.0")
D 113 mm (4.4")
© 2013 Littelfuse Protection Relays & Controls
Littelfuse.com/se-502
Rev: 4-A-050213
Based on Manual Rev 0
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