Siemens 5SM2325-0 Circuit Breaker

Siemens FI-Block 5SM2325-0 is a residual current unit (RCU) designed for use with the Siemens 5SY two-pole circuit-breaker family, providing two-pole residual-current protection for AC circuits. It is specified as Type AC with a rated current of 63 A (In), a rated system voltage of 230 V AC (Un), and a residual current setting of 30 mA (IΔn). When leakage current exceeds 30 mA, the device trips to disconnect the circuit, helping protect against electric shock and reduce fire hazards from earth faults. This 5SM2325-0 RC unit is marketed as the FI-Block accessory for 5SY protection systems, suitable for installations where 230 V AC supplies and 63 A line currents are present, and it complements the standard 5SY breakers by adding residual current protection. Typical applications include modular distribution boards in residential, commercial, and light industrial environments where ground-fault protection is required and Siemens' 5SY/FI-Block lineup is installed.