The Siemens 3RV1341-4MC10 is a SIRIUS circuit breaker designed specifically for starter combinations — meaning it integrates the motor-protective and short-circuit functions in one device, sized for a 45 kW motor at 400 V AC. Its 100 A continuous current rating and 50 kA breaking capacity at 400 V mean it can handle both sustained motor load and fault interruption up to that fault level without upstream fuses needing to clear the arc. Mounts via screw and snap-on onto 35 mm DIN rail per DIN EN 50022, with zero clearance required backwards or at the side — so it fits tight panels without derating for proximity. The screw-type box terminals on the main circuit accept 2x (2.5…16 mm²) solid or 2x (10…50 mm²) stranded, 1x (10…70 mm²) stranded, covering the full conductor range for a 100 A feed.
Breaking capacity and selectivity
The 50 kA at 400 V AC is the high-fault rating that lets this breaker serve as the main feeder protection in a panel with a transformer upstream. At 690 V it still clears 5 kA, which covers most industrial motor circuits. The 100 kA at 240 V is relevant for 240 V line-to-line or single-phase taps. These SCCR values mean the 3RV1341-4MC10 coordinates cleanly with downstream contactors and overloads without needing a current-limiting fuse ahead of it — a real panel-space saver.
Integration notes
Dimensions: 70 mm wide, 165 mm high, 174 mm deep — fits a standard 8-module DIN-rail slot. The IP20 finger-safe touch protection on the front means it can be mounted in a panel with the door open during commissioning without shock hazard. Operating temperature -20 to +60 °C; storage -50 to +80 °C. Shock rated 25g / 11 ms. Mounting position any — no derating for horizontal or vertical orientation.