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


This devices meets or exceeds compliance with the upcoming 2014 NEC 250.167(B) code for ground fault detection on grounded DC systems.

The RCMA420 monitors for ground fault current in grounded and high-resistance grounded AC systems, both single-phase and three-phase, as well as pure DC and mixed AC/DC systems. The RCMA420 reads a true RMS value, and displays the read ground fault current in real-time on the built-in digital display. The RCMA420 features a steplessly adjustable setpoint from 10 mA to 500 mA. Along with the main alarm value, a prewarning alarm, set as a percentage of the main alarm value (50 to 100%), 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.

Compatible current transformers include the W20AB, W35AB, and W60AB.

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