The Siemens 3RV1341-4JC10 is a SIRIUS circuit breaker designed specifically for starter combinations — the kind that sits between a contactor and the motor, providing short-circuit and overload protection in a single, coordinated package. Rated 63 A continuous and 30 kW at 400 V, it breaks up to 50 kA at 400 V AC, which means it can safely interrupt a fault on a high-capacity distribution panel without cascading upstream. The 174 mm depth and 70 mm width fit a standard DIN-rail footprint; screw and snap-on mounting per DIN EN 50022, any mounting position.
Breaking capacity and selectivity
The 50 kA breaking capacity at 400 V is the headline number for panel coordination. At 240 V it reaches 100 kA, at 500 V it drops to 12 kA, and at 690 V to 6 kA. That curve tells you this breaker is sized for 400 V distribution where the prospective fault current is high — typical of a main motor feeder in a 400 V industrial panel. The 6 kV surge voltage resistance supports the insulation coordination for that voltage class.
Termination and wiring
Main circuit terminals are screw-type box terminals. Solid wire: 2x (2.5 to 16 mm²). Stranded: 2x (10 to 50 mm²) or 1x (10 to 70 mm²). Finely stranded with ferrule: 2x (2.5 to 35 mm²) or 2.5 to 50 mm². AWG equivalents: 2x (10 to 1) or 1x (10 to 2). Auxiliary and control circuit terminals are also screw-type. The auxiliary switch option is available. Touch protection is finger-safe (IP20 on the front).
Thermal and environmental limits
Power dissipation at rated load in hot operating state: 34 W total, 11.3 W per pole. Operating temperature range -20 to +60 °C; storage and transport -50 to +80 °C. Shock resistance 25g for 11 ms. Maximum operating frequency in AC-3 duty: 15 operations per hour. These numbers matter for panel thermal design — 34 W in a sealed enclosure needs ventilation or derating above 40 °C.