The Siemens 5SU1154-0KV10 is a combined residual-current and miniature circuit breaker (RCBO) — an FI/LS protector in Siemens' 5SU1 series. It integrates Type AC residual-current detection at 10 mA sensitivity with a 10 A B-curve overcurrent trip in a single 1+N-pole module.
The 10 mA residual sensitivity (IΔn) is the key differentiator here — standard RCBOs are typically 30 mA. A 10 mA device is specified for circuits where a lower earth-leakage threshold is required, such as final subcircuits supplying wet areas or equipment sensitive to leakage currents. The B-curve (3-5 In) trips on short-circuit within the standard instantaneous range, suited for resistive or lighting loads with low inrush. The 1+N-pole form factor occupies a single modular width on a DIN rail, matching the standard 18 mm per pole spacing in distribution boards.
Deployment Context
Snap-on DIN-rail mounting for panel or enclosure integration. The 70 mm depth (D=70mm) is a standard dimension for this class, fitting most consumer units and sub-distribution boards without depth clearance issues.