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AC-160d (7/07) Page 2 of 4
Construction
System operation
The relay is provided in a non-conducting phenolic case,
with provisions for panel mounting or mounting to a
standard DIN rail (panel mounting is recommended for
mounting on a generator set). Relay components are
fully potted with epoxy resin for vibration resistance and
durability.
The relay includes an integral terminal block assembly,
which accepts wires up to 12-gauge.
Relay function selection link (auto/hand reset).
Environmental range - Operating -10 °C to +60 °C,
storage -40 °C to 80 °C.
Power input - 5 VA at 24 VDC.
Transfer switch type selection link - (3-pole or
4-pole).
The ground fault relay continuously monitors the voltage
across the neutral-to-ground bonding jumper and lights
the ground fault alarm lamp on the generator set control
when the connection is broken.
When the generator set is running, the relay continuously
monitors the line-to-neutral generator set connection and
lights the ground fault alarm lamp on the generator set
control when a ground fault condition is sensed.
Alarm condition can be cleared by pushing the reset
switch on the generator set control panel. Actual ground
fault current level can be monitored with a 0-1 mA meter,
directly from the relay. A push button test switch is
provided to simulate ground fault conditions and operate
the relay and indication circuitry. Addition of the auto-
reset link activates automatic reset of the relay after the
ground fault condition has cleared.
System schematic
Separately derived system connections (local grounding connection).
Neutral-to-ground bonding jumper must be sized per code requirements. For non-separately derived systems
(3-phase/4-wire systems with 3-pole transfer switch), the ground connection and the neutral-to-ground bonding jumper
on the generator set are removed, and the 3-pole ATS link is added to the ground fault relay. For non-separately
derived systems a label must be applied to the service entrance switchboard, indicating that removal of the equipment-
bonding jumper can cause hazardous operating conditions.
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