Residual circuit devices (RCDs) ABB offers residual current devices that are UL 1053 and IEC certified. RCDs are sensitive devices that switches off an electrical circuit in the event of a fault. If either a fault occurs or the voltage goes above zero, a leakage current flows to the ground, creating an unevenness that causes the toroidal transformer inside the RCD to trip the mechanism.

• Available in 2-poles and 4-poles
• Rated from 16 A up to 125 A
• Rated sensitivity from 10 mA up to 1000 mA