The Sigma SCRC03 Reclosing Unit is an accessory that automatically re-engages the residual current circuit breaker (RCCB) to ensure system continuity whenever the breaker trips due to transient causes.

Sudden surges in the electrical grid, transient voltage fluctuations, and harmonic components can be incorrectly detected by the residual current circuit breaker as a system leakage. Once these transient events pass, residual current is no longer present in the system.

When a transient event trips the breaker, the Sigma SCRC03 RCCB Reclosing Unit waits for 10 seconds after the initial trip before automatically resetting the breaker. If the residual current persists, the RCCB trips again, and the Sigma SCRC03 waits 60 seconds before making a second reclosing attempt. If the residual current still remains, the third and final reset occurs at the 300th second. If the breaker trips again at this stage, manual intervention is required to resolve the fault in the system.