GFR Series - Ground-Fault Relay

Series: GFR
Replaced By: PGR-6100, PGR-6101
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Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless otherwise agreed by Littelfuse. "Littelfuse" includes Littelfuse, Inc., and all of its affiliate entities.

The GFR-4000 ground fault relay is specifically designed to provide complete motor protection without the problems associated with high sensitivity nuisance tripping.

It is unique because it has predictive as well as protective capabilities. A metering output can be used to signal a remote meter or PLC so that ground faults may be detected at an early stage. The GFR 4000 operates on grounded, high resistance grounded and ungrounded systems. The unit can be directly connected to supplies up to 1300V, 1PH or 3 PH, 50-60 HZ. For supplies from 1300 V to 5000 V, the GFR 4000 must be connected to the HTC 5000 high tension coupling unit.

Features/Benefits:
  • Adjustable sensitivity from 10 mA t to 3.0 A to reduce nuisance trips.
  • Precise insulation resistance readings indicate problems in advance
  • Adjustable time delay adapts to unique applications.
  • Fail-safe operation
  • On Line monitoring of ground to detect any change in leakage current
  • Off line monitoring of insulation resistance to notify or halt unacceptable levels
  • C.T. Loop Monitoring
  • Test/Reset buttons to assure operation
  • NO/NC form "C" output alarm relay contacts

Access specifications, certifications, check availability and order parts below

Catalog #DimensionsCompare
GFR4000
Obsolete: 2013 -09-06
2.96 H X 3.94W X 4.3 D
GFR4001
Obsolete: 2013 -09-06
2.96 H X 3.94W X 4.3 D
GFR4001-IM
Obsolete: 2013 -09-06
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