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and Cummins are registered trademarks of Cummins Inc. “Our energy working for you.”, PowerCommand and Detector are trademarks of
Cummins Power Generation.
AC-160d (7/07) Page 1 of 4
Ground fault indication
relay - H550
Code requirements
Features
NFPA 70, the U.S. National Electrical Code (NEC) requires
that services of 1000 amps and larger in capacity which
operate at more than 150 volts from line-to-neutral must be
provided with ground fault equipment. Generator sets rated
at 100 amps and larger which serve as emergency power
must be provided with ground fault indication equipment.
Health care facilities that utilize ground fault protection
equipment must be provided with a coordinated multi-level
ground fault system.
Cummins Power Generation ground fault indication
equipment is designed for use in emergency/standby power
systems, for indication of ground fault conditions during
generator set operation.
Suitable for indicating a ground fault condition on a
generator set which is either locally or remotely
grounded.
Power - Operates on 24 VDC (nominal) control power -
fully functional at voltages from 18-30 VDC.
Direct connection - Suitable for direct connection to
generator sets operating at voltages up to 600 VAC (line
to line).
Ground fault current settings - 100-1200 A, in 10
discrete settings: 100, 150, 200, 250, 300, 450, 600,
750, 800, 1200 A.
Monitoring - Provides continuous monitoring of
neutral-to-ground with LED indication for open
connection.
Factory mounted controls - Available factory-
mounted and interconnected to Cummins Power
Generation Detector™ series PowerCommand
®
controls.
Link reconnection - For use with either 3-pole (solid
neutral or 4-pole (switched neutral) transfer switches.
Indicating lamps - For Relay on (green), ground fault
current over setting (red), loss of ground connection
(red).
Time delay settings - 0-1.0 seconds.
Circuit board - One-piece molded case fully potted.
Contacts - One set of form C output, rated 1100 VA,
250 VAC, 5 A continuous, 3 A breaking @ 240 VAC.
“Test” - Push-button.
“Reset” - Push-button.
Percent full scale metering output - 0-1 mA full
scale.
Bonding jumper - Sized per NEC requirements.
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