Products & Services

 

IGFR Ground Fault Relays  

Intermountain Electronics is pleased to present the newly-designed IGFR line of Ground Fault Relays (GFRs).  Each IGFR has been designed for reliable operation, and to be a major upgrade over other relays that have been used in mining and other industries for many years.

Upgrading an outdated relay with a new IGFR is simple, because the IGFRs have been designed to directly replace common GFRs that have been used extensively in the past.  Electrical connections and mechanical mounting are fully compatible, so a replacement can be made in minutes. 

The IGFRs are more compact than the old GFRs they replace, even though they mount in the same panel cutout.

IGFR-1 Ground Fault Relay

The IGFR-1 Ground Fault Relay (GFR) detects zero-sequence ground fault currents, and it is designed to trip at less than 6 amps, using IE Current Transformers (Part numbers: 1100-0001 for 2” ID, 1100-0002 for 3” ID). 

A circuit breaker on the IGFR-1 trips when a ground fault above the threshold is detected.  The circuit breaker is used as an indicator, and it also provides NO, NC, and C auxiliary contacts for use with under-voltage or shunt trip breakers.

Once tripped, the circuit breaker remains in the tripped position until manually reset. 

The IGFR-1 features a test button to verify proper operation of both the circuit breaker and the current transformer.

To download the spec sheet click here.

Compatible Products

 
1100-0001 CT (2" ID)

 
1100-0002 CT (3" ID)


1020-0076 Fanning Strip

 

IGFR-2 Adjustable Ground Fault Relay

The IGFR-2 Ground Fault Relay (GFR) detects zero-sequence ground fault currents through a Current Transformer (CT), and its relay trips when these currents exceed a settable limit between 3.3A and 15A.  Once tripped, the IGFR-2 remains latched until it is manually reset.

The IGFR-2 can be set for Normally Open (NO) or Normally Closed (NC) operation, for use with undervoltage or shunt trip breakers.

A green PWR LED is lit when the IGFR-2 is on.  The red TRIP LED lights when a trip occurs, and remains lit until the GFR is reset.

The IGFR-2 is designed to be used with the 1100-0006 CT.  When used with this CT, the IGFR-2/CT is suitable for use in resistance grounded 3-phase power circuits that are NGR-limited to no more than 25A.  Other properly designed CTs may be used with the IGFR-2 to allow operation in other types of circuits.  

To download the spec sheet click here.

Compatible Products



1100-0006 CT (2.5" ID)
1100-0007 CT (4.25" ID)
1020-0076 Fanning Strip

IGFR-3 Ground Fault Relay

The IGFR-3 Ground Fault Relay (GFR) detects zero-sequence ground fault currents, and it is designed to trip at less than 5 amps, using a compatible Current Transformer (CT). 

The circuit breaker on the IGFR-3 trips when a ground fault is detected.  Once tripped, the circuit breaker remains in the tripped position until manually reset. 

The IGFR-3 features a test button to verify proper operation of both the circuit breaker and the current transformer.  

To download the spec sheet click here.

Compatible Products

1100-0016 CT w/ 2"ID
1100-0017 CT w/ 2" ID w/ Mounting Bracket
1100-0018 CT w/ 3" ID
1020-0075 Fanning Strip (Uses 2)

IGFR-4, IGFR-5 Ground Fault Relays w/ Time Delay  

The IGFR-4 and IGFR-5 Ground Fault Relays (GFR) detect ground fault currents by monitoring the voltage across a Neutral Grounding Resistor (NGR).  The relay trips when a phase-neutral fault occurs, causing fault currents to flow through the NGR.

The IGFR-4 is designed to be connected directly across the NGR, and is used for 480V and 600V systems (1000V with the addition of two external resistors).

The IGFR-5 is designed to connect to an NGR through a step-down potential transformer (PT), which has a  primary rated at the system line-neutral voltage, and a 120 VAC secondary.  The PT is not included.

Both GFRs feature adjustable time-delay settings.

To download the spec sheet for the IGFR-4 click here.
To download the spec sheet for the IGFR-5 click here.
Compatible Product: 1020-0075 Fanning Strip