What this SIRIUS circuit breaker is and where it fits
The Siemens 3RV2332-4SC10 is a SIRIUS-brand circuit breaker designed specifically for starter combinations — meaning it integrates the motor-protective and short-circuit functions into one device ahead of a contactor, saving panel space and wiring compared to a separate MCB and overload relay. It mounts via screw and snap-on onto a 35 mm DIN rail per DIN EN 60715, in any orientation, so it fits standard European control-panel backplates without special brackets.
Breaking capacity — what the numbers mean for your fault level
The 3RV2332-4SC10 delivers 100 kA breaking capacity at 240 V AC and 50 kA at 400 V AC — per the datasheet, these are the short-circuit current levels it can safely interrupt without welding contacts or rupturing the housing. At 500 V AC it still holds 10 kA, and at 690 V AC it manages 5 kA, so it covers the common industrial voltage tiers from 240 V single-phase up to 690 V three-phase.
Mounting and integration details
Fastening is by screw and snap-on onto a 35 mm DIN rail per DIN EN 60715; mounting position is any, so it can be installed horizontally or vertically without derating. Dimensions are 55 mm wide, 140 mm high, and 149 mm deep — the 55 mm width means it occupies three standard 18 mm DIN-rail module spaces, so plan your rail fill accordingly. Clearance requirements: 50 mm upwards and downwards, 10 mm to the side, and 0 mm forwards or backwards — the zero forward clearance means it can be mounted flush against a panel door or cover without extra breathing space.
Termination and wiring
Main contacts use M6 screw-type terminals; the wiring range accepts 2x (1 to 35 mm²) or 1x (1 to 50 mm²) solid or stranded copper — sized for the motor feeder currents this breaker typically protects.