Specifications

External Accessories

Ground Fault Monitor

The Ground Fault Monitor (GFM) is an optional module that

allows the user to locally monitor the ground fault current and

can be used in trip units with or without the integral ground

fault protection function. Trip units with the integral ground fault

protection function are identified by a “G” in the catalog num-

ber and the presence of ground fault adjustments on the face

of the trip unit. If the trip unit is equipped with ground fault

protection, the Ground Fault Monitor utilizes the same ground

fault sensing method as the electronic trip unit. If the trip unit

is not equipped with ground fault protection, then the GFM

uses a residual ground fault sensing method. The Ground Fault

Monitor works independently from the trip unit’s ground fault

protection.

Ground Fault Monitor Settings

There are three ground fault pickup levels offered on the

Ground Fault Monitor:

“LO” equals 20% of the frame rating.

“HI” equals the MAX rating of 1200A, whichever is less.

“MED” equals the average of “LO” and “HI” pickup levels.

The ground fault delays are divided into three fixed time delay

bands: 0.1, 0.3, and 0.5 seconds.The “MAX” setting is defined

as a 1200A pickup and 0.5 second delay.

Display

The Ground Fault Monitor displays the ground fault current in

amps. When the ground fault current reaches a level of 12%

below the selected pickup setting, the amps display will start

to flash. Then the ground setting, the display will flash “-OL-”

for overload and the alarm line will be set to its “ON” state.

Remote Interface

The Ground Fault Monitor can be utilized with a Display

Module Relay, a Bell Alarm and Alarm Relay Combination

Module, (mounted inside the breaker) or a Remote Indicator

Panel (externally-mounted) to provide a set of relay contacts

for ground fault alarm. When used in conjunction with either of

these devices and a Shunt Trip, the Ground Fault Monitor can

be used as Ground Fault Sensing and Relaying Equipment per

UL-1053. For more information, see the Installation Instructions

for the Ground Fault Sensing and Relaying System.

Also, note that if the Ground Fault Monitor is removed while

the circuit breaker is powered up the alarm line will be set to

its’ “ON” state.

NOTE: Option for Ground Fault Detection and Alarm with-

out tripping in accordance with NEC Article 700 Section

700-26 is available. Consult Siemens Sales Office for fur-

ther information.