FI/LS compact 1P+N 6kA type A 30mA B10 The FI switch is the residual current protection device for touch protection The patented residual current protection devices from Siemens are an important component of the SENTRON protective components for electrical installation, because they prevent life-threatening electric shocks through safe switching off of dangerous fault currents against earth. Electrically ignited fires can be prevented even in the . Whether by direct contact with live parts during operation or by indirect contact with equipment, the protection is achieved primarily by rapid shutdown. The Siemens 5SV FI circuit breakers are characterized above all by: 1. Comprehensive protection for persons and property against electric shock. 2. Whether sinusoidal AC fault currents or smooth DC fault currents, Siemens offers the right type and special versions for all requirements. 3. Reliable safety during installation thanks to the standard included comprehensive and touch protection.