FI residual current circuit breaker, 4-pole, Type A, time-delayed, In: 63 A, 100 mA, Un AC: 400 V, can be secured against overload with rated current. The RCD is the residual current protective device for touch protection. Siemens' patented residual current devices are an essential part of the SENTRON protection components for electrical installations, as they prevent life-threatening electrical accidents by safely disconnecting dangerous fault currents to ground. Electrically ignited fires can be prevented right from their inception. Whether through direct contact with live parts or through indirect contact with operating equipment, protection is primarily achieved through rapid disconnection. The Siemens FI circuit breakers 5SV are characterized by: 1. comprehensive protection for persons and property against electric shock 2. Whether sinusoidal alternating fault currents or smooth direct fault currents - Siemens offers the right solution for all requirements.