The Siemens 5SU1154-0KV13 is a combined residual-current and miniature circuit breaker (RCBO) — an FI/LS protector — in a single 1+N-pole module. It integrates Type AC earth-leakage detection at 10 mA sensitivity with a 13 A B-curve overcurrent trip, all rated for 10 kA breaking capacity. The 70 mm depth fits standard Siemens distribution boards and DIN-rail enclosures.
The 10 mA IΔn (rated residual operating current) is the key spec for this RCBO: it detects earth faults down to 10 mA, which is the threshold for additional protection against lethal shock in wet or exposed locations (bathrooms, construction sites, outdoor sockets). The B-curve (13 A) means the magnetic trip activates at 3–5× rated current, so it clears short-circuit faults fast while tolerating moderate inrush from lighting or small motor loads.