GFR Series Ground Fault Relays from Duncan Inst.

The GFR Series relays protect industrial electrical equipment such as motors, transformers and feeders, against the damage caused by low magnitude ground currents. GFR-2/3 work effectively on both high and low resistance grounded distribution systems. The package consists of: Ground Fault Protection Relay and Zero Sequence Current Transformer.

GFR-2

Technical Information

• Power Supply: 115AC + 10% - 20%, 50/60Hz, 3VA
• Tripping Range: See Ordering Information
• Output Contacts: DPDT, 3A @ 115VAC or 28VDC
• Repeatability Better than 1%.
• Temperature Range: -10°C thru + 55°C
• Operating Time: 50 msec. (typical)
• Duty Cycle Continuous
• Weight (approx.): 0.3 kg
• Dimensions: 50 x 70 x 100 mm
• Mounting Position: As required
• Terminal Wire Size: 2 x 14 AWG (Solid)

GFR-3

GFR-3 is an enhanced version of our GFR-2 with built-in self-test circuit and adjustable time delay. The self-test is activated by the TEST pushbutton. This test will trip both the Ground Fault Relay and the breaker. NO-TRIP pushbutton is also provided to test the Ground Fault Relay without tripping the breaker.

Technical Information

• Power Supply: 115VAC, + 10%, -20%, 50/60Hz, 9VA max
• Tripping Range: See Ordering Information
• Repeatability Better than 1%.
• Temperature Range: -10°C thru + 55°C
• Output Contacts: DPDT, 10A @ 115VAC; 2 - N.O. in series - 1A @ 250VDC
• Operating Time: 0.1 thru 1.2 sec., adjustable
• Duty Cycle Continuous
• Weight (approx.): 0.7 kg
• Dimensions: 175 x 115 x 75 mm
• Mounting Position: Semi-flush panel mount
• Terminal Wire Size: No. 22AWG to No. 12AWG