The CFA563J RCD breaker with Inom (Rated short-circuit breaking capacity) of 63A, Ires (Rated residual current) of 300mA, and Max surge current of 250A, is a DIN-mount, high-performance circuit breaker manufactured by Hager. It is designed to protect people and property from electric shocks due to accidental shorts in electrical systems. It offers high short-circuit breaking capacity and reliable air insulation that conforms to rigorous safety requirements. This RCD breaker is designed for applications where the rated existing short-circuit currents exceed the rated short-circuit breaking capacity of conventional MCB’s.