Digital ground fault detector for ungrounded single-phase AC systems up to 300 V


This device meets or exceeds the requirements of NEC 250.21(B) and CEC 10-106(2) for ground detectors in ungrounded systems.

The IR420-D4 monitors for ground faults in ungrounded single-phase AC systems up to 300 V by measuring the system's insulation resistance. A response value may be set in the range of 1 kΩ to 200 kΩ. The digital display shows the read insulation resistance in real time. All settings are also changed from the digital display. Two separate SPDT contact outputs may be set to normally energized or normally deenergized operation.

The IR420-D4 utilizes an external supply voltage for power, which allows deenergized systems to also be monitored.

Key Features
Technical Data
Ordering Information