The Siemens 3RV2311-0JC20 is a SIRIUS circuit breaker designed specifically for starter combinations — meaning it integrates directly into motor starter assemblies, providing short-circuit and overload protection in a single compact unit. Its size S00 frame (45 mm wide, 97 mm deep, 106 mm tall) fits the standard 35 mm DIN rail per DIN EN 60715, with screw and snap-on mounting that lets you clip it into a panel without tools. The 100 kA breaking capacity at 400 V AC (and equally at 240 V, 500 V, 690 V) means it can safely interrupt high fault currents common in industrial distribution, protecting downstream contactors and motor loads without cascading upstream. For a 230 V motor circuit, it supports up to 0.2 kW motor power, sized for small drives like pumps or conveyors.
Compared to the earlier SIRIUS 3RV2011-0BA20 (also size S00, 100 kA at 400 V), the 3RV2311-0JC20 shares the same frame footprint and breaking capacity, but the 3RV2311 is designated for starter combinations while the 3RV2011 is a general-purpose motor-protective breaker. The 3RV2311-0JC20 uses spring-loaded terminals for the main circuit, whereas the 3RV2011-0BA20 typically uses screw terminals — so a panel wired for screw terminals may require terminal adapter or re-termination if swapping directly. Both mount on 35 mm DIN rail, so the mechanical fit is identical.
Mounting position is any orientation, which simplifies panel layout. The spring-loaded terminals accept 2x (0.5 to 4 mm²) solid or stranded wire — no ferrules needed, but a 3 mm diameter screwdriver shaft is specified for the terminal screws. Clearance requirements: 50 mm upwards and downwards, 30 mm to the sides, 0 mm forwards and backwards — so it sits flush against the mounting plate. Ambient operating temperature range is -20 to +60 °C; storage and transport range is -50 to +80 °C.