PGR-3200 Series – Ground-Fault and Insulation Monitor Series - Littelfuse PGR-3200 Relays Provide Superior Ground-Fault Protection

External overview image
Roll Over to Zoom
Disclaimer Notice

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 PGR-3200 series insulation monitor operates on ungrounded ac systems. This unit detects ground faults by continuously monitoring the insulation integrity of ungrounded electrical systems. It monitors the insulation for damage and assists with predictive maintenance and troubleshooting of developing ground-faults by providing a warning or an alarm. The three levels of detection are: a 50 kΩ warning with an LED and output contact indication; a 30 kΩ warning with LED indication; and a 10 kΩ alarm with LED and output contact indication. An analog output is provided for predictive maintenance trending. The PGR-3200 operates on one- or three-phase ungrounded systems up to 6 kV. This unit can also be used on a grounded system to monitor the insulation for damage while the power system is de-energized. The mode-of-operation terminals (27-28) are connected to the circuit breaker or contactor auxiliary contacts to toggle the relay off when the contactor or breaker is closed.


  • NEC® and CEC code compliant
  • Output contact (50 kΩ)
  • Output contact (10 kΩ)
  • DIN-rail or surface mount
  • Analog output (0–1 mA)
  • POWR-GARD® technology

Access specifications, certifications, check availability and order parts below

Catalog #Supply
Relay Contacts ConfigIEEE Device NumbersRelay
Weight (lbs/g)Auto Manual ResetConformally coatedFrequencyInsulation Resistance kOhmsSystem typeTest ButtonSamplesCompare
PGR-3200240N/AN/A27 - 64Non Fail-safe0 KgLatching; AutoresetOptional50; 60Warnings at 50 and 30; Alarm at 10Ungrounded ACFront-panel switchOrder
PGR-3200-120120N/AN/A27 - 64Non Fail-safe0 KgLatching; AutoresetOptional50; 60Warnings at 50 and 30; Alarm at 10Ungrounded ACFront-panel switchOrder
To request product environmental information, please complete the Product Environmental Information Request Form.

  • Showing 3 items