The Siemens 3RV2342-4YC10 is a SIRIUS circuit breaker designed specifically for starter combinations — meaning it integrates motor protection and disconnecting functions in one device, sized for a motor branch circuit rather than a distribution feeder. It mounts via screw or snap-on onto 35 mm standard mounting rail per DIN EN 60715, in any position, so panel layout is flexible. The interrupting rating is what decides fit here: 50 kA at 400 V AC (and 100 kA at 240 V AC) means it can safely clear a fault up to that level without the arc flashing over to adjacent gear — critical for high-fault-capacity industrial panels where the upstream transformer is large. At 690 V AC the rating drops to 6 kA, so verify the available fault current at your service voltage before specifying.
Mounting and wiring
Screw-type terminals on the main circuit accept solid or stranded conductors: 2x (2.5 … 50 mm²) or 1x (10 … 70 mm²) for the power path, and 2x (2.5 … 16 mm²) for the control/auxiliary circuit. The 176 mm depth and 70 mm width fit standard 8-module DIN-rail spacing — no overhang into adjacent device slots. Clearance requirements: 150 mm upwards and downwards, 30 mm at the sides, zero forwards or backwards.