The Siemens 5SU1154-1KV06 is a combined residual-current device and miniature circuit breaker (RCBO), designated as an FI/LS protector. It integrates Type AC earth-leakage detection with a 10 mA rated residual current (IΔN) and a 10 kA breaking capacity into a single 1+N-pole unit, with a C-curve thermal-magnetic trip characteristic set at 6 A.
The 10 mA sensitivity (IΔN) is specified for circuits requiring enhanced protection against electric shock, such as socket outlets in wet areas or circuits supplying portable equipment in commercial or industrial installations. The C-curve (6 A) provides a magnetic trip threshold of 5 to 10 times rated current, suited to moderate inrush loads like small motors, fluorescent lighting banks, or control transformers.
The 10 kA breaking capacity (Icn) means this device can safely interrupt fault currents up to 10,000 A under standard test conditions, which covers the prospective short-circuit current at the point of installation in most residential and light commercial distribution boards.