Rated operating range
The Siemens 5SU1656-6KV25 is a combined residual-current circuit breaker with overcurrent protection (RCBO), designated FI/LS protector Type A (PSE/SSF). It integrates a 25 A B-curve miniature circuit breaker with a 300 mA residual-current device into a single 1+N-pole module. The 6 kA short-circuit breaking capacity covers the majority of residential and light commercial distribution boards where the prospective fault current stays within that limit.
Deployment context
The 70 mm depth fits standard DIN-rail enclosures used in final-distribution sub-boards. Type A sensitivity detects pulsating DC residual currents in addition to sinusoidal AC — relevant for circuits feeding single-phase rectified loads such as washing machines, LED drivers, or EV chargers where Type AC devices would be blind to the fault signature.