Type B RCCB RCD 2P 4P 40A 63A 30mA-300mA 10KA DIN Rail AC Breaker
This is an RCCB (Residual Current Circuit Breaker) which provides leakage protection only. It does not include short-circuit protection. Type B RCCBs, in addition to normal AC, can detect high frequency AC and pure DC earth leakage currents.