Tronic Residual Current Circuit Breaker, 4 Pole Electromagnetic, 630A, 300mA

Our review

This is a four-pole residual current circuit breaker from Tronic, built on electromagnetic operating principles to trip when it detects leakage current. Its headline numbers are a 630A current rating and 300mA sensitivity, which places it in the heavier end of earth-leakage protection rather than the small domestic devices many people picture. That combination tends to suit larger installations where substantial current flows and where the priority is protecting equipment and cables from sustained leakage rather than guarding a single final circuit. Before buying, confirm your system's voltage, pole configuration and whether your earthing arrangement matches an electromagnetic RCCB, and check that 300mA is the sensitivity your design calls for, since lower-rated devices are common for socket circuits. Compare it with other four-pole breakers on current rating, sensitivity and trip type, and consider whether you need residual current protection alone or a combined RCBO. It is available on Sokonia.