A Type GFR ground fault protection system, when properly installed on a grounded electrical system, will sense phase-to-ground fault currents. When the level of fault current is in excess of the pre-selected current pickup and time delay settings, the GFR relay will initiate a trip action of a disconnect device, which will open the faulted circuit and clear the fault.
The GFR devices are UL Class I devices designed to protect electrical equipment against extensive damage from arcing ground faults
A basic Type GFR ground fault protection system consists of a ground fault relay, a ground fault current sensor and a disconnect device equipped with a shunt trip device. This disconnect device can be a molded case circuit breaker, a power circuit breaker, a bolted pressure switch or other fusible disconnect device, suitable for application with UL Class I ground fault sensing and relaying equipment.
Note: Suitable for either surface or semi-flush mounting.
Eaton’s GFR ground fault relays, current sensors, test panels and accessory devices are UL listed by Underwriters Laboratories in accordance with their standard for ground fault sensing and relaying equipment, UL 1053, under File E48381.
Note: Relays are also listed with CSA under their file number 43357.
Each installation requires:
- One relay unit (select trip ampere as required)
- One current sensor (select configuration required)
- One circuit breaker or disconnect device with shunt trip, or a shunt trip attachment for mounting in existing breaker
- Test panel (optional)
NOTES:
(1) Suitable for either surface or semi-flush mounting.
(2) One end removable for installation.
Additional optional equipment can be added to the protection system to meet the requirements of the specifying engineer, including:
- Ground fault test panel
- Ground fault warning indicator relay
- Ground fault indicating ammeter
GFR relays are available with zone selective interlocking circuitry to interlock several relays within the same system. This allows the relay which detects a ground fault to instantly clear the fault by tripping the disconnect device. The relay simultaneously sends a signal to relay units “upstream” from the fault to time delay or to block their operation completely. Current sensors in various designs provide a range of “window” sizes to accommodate standard bus and cable arrangements.
Shunt trip attachments may be ordered for field mounting in Eaton’s molded case circuit breakers, or may be ordered factory installed in the breaker.
Used to test the ground fault system, to give an indication the relay has tripped the breaker, and to reset the relay after tripping. These functions may be separately mounted pilot devices.
Note: When a mechanically reset relay is used with a test panel, both the relay and test panel must be reset following either a simulated ground fault test or actual ground fault. Not UL listed.
This is an accessory item for use with GFR relays with interlocking circuitry. At approximately 30–50% of the relay pickup setting, the indicator switches separate 120 Vac control power to a lamp or relay, (not included) to give an indication of a ground fault. The indicator is rated 110/120 Vac 50/60 Hz for a maximum indicator load of 0.5 amperes.
The optional indicating ammeter connects to the sensor terminals through a momentary contact pushbutton, and will indicate (in amperes) any ground fault current flowing through the sensor. Kit includes the ammeter and pushbutton.
Note: Not UL listed.
Shunt Trip Attachments
Use 120 Vac shunt trips.
Faceplate
Recommended when these relays are semi-flush mounted, to close the door cutout opening.
| Description | Part Number |
| Faceplate | 752B410G01 |
Technical Data and Specifications
Sensor
- 600 volt, 50/60 Hz maximum system voltage
Electrical Ratings — GFR Relay
- Ground fault detection ranges:
- 1 to 12, 5 to 60 or 100 to 1200 amperes
- Output contacts:
- 240 volt, 50/60 Hz:3.0 amperes
- 120 volt, 50/60 Hz: 6.0 amperes
- 28 Vdc: 3.0 amperes
- 125 Vdc: 0.5 amperes
- Control power requirements:
- 120 volt, 50/60 Hz or 125 Vdc (optional)
