Digital ground fault monitor for grounded AC/DC systems

The RCMA420 monitors for ground fault leakage current in grounded and high-resistance grounded single- and three-phase AC, pulsed DC, and pure DC systems (Type B). Features include adjustable setpoint from 10ma...10A, LCD display, adjustable time delay, fault storage, 2 SPDT alarm relays which can be set for normally energized and normally de-energized operation. An external BENDER current transformer is required for operation.

  Also required: Current transformer from the WAB series. Datasheet
  Use our CT Selector to find the correct and optimal CT for your system.

 Technical Specs                 Datasheet

Digital ground fault monitor

The RCMA423 monitors for ground faults in grounded and high-resistance grounded AC (both single- and three-phase), DC, and mixed AC/DC systems. The RCMA423 is specially designed to provide advanced warning of developing ground faults without the problems associated with high sensitivity nuisance tripping. A digital LCD screen displays real-time measurements of the system's ground fault current. Two separately adjustable SPDT contacts allow for information transmission (such as to a PLC) or power interruption (such as through a contactor or shunt trip breaker). Since the values are measured with measuring current transformers, the device is nearly independent of the load current and the nominal voltage of the system.

 Technical Specs                 Datasheet

Ground fault monitor for grounded AC/DC systems with internal CT

The RCMA475LY monitors for ground fault leakage current in grounded & high-resistance grounded single & three-phase AC, pulsed DC, and pure DC type systems (Type B). Features include two seperately adjustable setpoints from 30mA...500mA for the main alarm and 50% of the set value for the pre-alarm, LED meter display (0-100%), adjustable time delay from 0...1 s for the pre-alarm and 0...10sec for the main alarm, fault storage, 2 DPDT alarm relays which can be set for normally energized and normally de-energized operation. Includes a built-in 18mm current transformer.

  Unit uses internal current transformer; external CT not required.

 Technical Specs                 Datasheet

Ground fault monitor for grounded AC/DC systems

The RCMA471LY monitors for ground fault leakage current in grounded & high-resistance grounded single & three-phase AC, pulsed DC, and pure DC type systems (Type B). Features include two seperately adjustable setpoints from 100mA...3mA for the main alarm and 50% of the set value for the pre-alarm, LED meter display (0-100%), adjustable time delay from 0...1 s for the pre-alarm and 0...10sec for the main alarm, fault storage, 2 DPDT alarm relays which can be set for normally energized and normally de-energized operation. An external BENDER current transformer is required for operation.

The RCMA471LY has a higher starting setpoint range than the RCMA470LY, but can use larger sized current transformers.

  Also required: Current transformer from the WB series. Datasheet
  Use our CT Selector to find the correct and optimal CT for your system.

 Technical Specs                 Datasheet

Ground fault monitor for grounded AC/DC systems

The RCMA470LY monitors for ground fault leakage current in grounded & high-resistance grounded single & three-phase AC, pulsed DC, and pure DC type systems (Type B). Features include two seperately adjustable setpoints from 30mA...3mA for the main alarm and 50% of the set value for the pre-alarm, LED meter display (0-100%), adjustable time delay from 0...1 s for the pre-alarm and 0...10sec for the main alarm, fault storage, 2 DPDT alarm relays which can be set for normally energized and normally de-energized operation. An external BENDER current transformer is required for operation.

The RCMA470LY has a lower starting setpoint range than the RCMA471LY, and uses smaller current transformers.

  Also required: Current transformer from the WB series. Datasheet
  Use our CT Selector to find the correct and optimal CT for your system.

 Technical Specs                 Datasheet