The Siemens 5SU1656-1KV10 is a combined residual-current and miniature circuit breaker (RCBO) — an FI/LS protector — in a single 1+N-pole module. It combines Type AC residual current detection at 300 mA with a C-curve overcurrent trip at 10 A, all rated for a 6 kA breaking capacity. The 70 mm depth (D=70mm) fits standard Siemens distribution boards and most DIN-rail enclosures without crowding the gland plate.
The 300 mA IΔn (rated residual operating current) is the trip threshold for earth leakage. The C-curve (10 A rated current) trips at 5–10× In for short-circuit protection, typical for lighting, socket outlets, and small motor circuits.
Deployment context
The 1+N-pole format occupies one module width plus neutral, so plan for 2 module-widths per unit in the enclosure layout.