Can the Ground Fault Alarm contact be used to trip the circuit breaker by means of a shunt trip to provide ground fault protection?
Powerpact P, Powerpact R, Masterpact NT, Masterpact NW
Electrical distribution systems
Requests to convert a ground-fault alarm system to ground fault protection.
The breaker can be tripped on ground-fault if the alarm contact is used to pass power to a shunt trip, but it would not acceptable as "ground fault protection" per the NEC. The NEC permits the maximum delay to be 1 second (for faults over 3000 A), and the minimum delay on GFA in the trip unit is 1 second; therefore the open time will be longer than the NEC allows. There are also uncontrolled variables such as an external relay and power supply that have not been tested as a GFP system for UL.