Digital ground fault monitor for grounded and high-resistance grounded AC systems


The RCM420 monitors for ground fault current in grounded and high-resistance grounded AC systems, both single-phase and three-phase. The RCM420 reads a true RMS value, and displays the read ground fault current in real-time on the built-in digital display. The RCM420 features a steplessly adjustable setpoint from 10 mA to 10 A. Along with the main alarm value, a prewarning alarm, set as a percentage of the main alarm value, may be set.

All settings for the device are changed via the device's onboard, easy-to-use menu. Three separate time delays may be utilized - a trip delay (0 to 10 s), a startup delay (0 to 10 s), and a delay on release (0 to 99 s). Two SPDT alarm relays may be set to normally energized or normally de-energized operation, and may be set to latching or non-latching operation. An external BENDER current transformer is required for operation.

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