The ABB 2CSR254001R1204 RCBO breaker is a four-pole overcurrent protection device, with an Inom of 20A, a Ires of 30mA, a rated operating voltage of 400VAC, designed for installation into a DIN rail, and rated IP20 for protection against solid objects in indoor locations. It provides overload, short circuit, and earth fault protection of electrical circuits, as well as power and energy control. The 2CSR254001R1204 is suitable for applications such as lighting and power sockets, as well as industrial electrical systems.