The RCDW-1 relay is meant for monitoring the tripping circuit continuity, and signalling of its lack.

The relay may monitor continuity in one breaking circuit regardless of the power breaker is closed or open. The RCDW-1 relay has one input element and one internal resistor shunting the power breaker. The input element is equipped with: LED indicating the state of the controlled circuit, two contacts – made in case of lack of circuit continuity or loss of the supply voltage, and a W/Z switch – turning on or off the input element. The relay is also equipped with a LED signalling power supply, and another LED indicating application of permanent switch-off impulse.