What it is and what it does
The Siemens 3RV2331-4WC10 is a SIRIUS circuit breaker designed specifically for starter combinations — meaning it integrates motor protection and disconnection in one device, sized for the motor branch rather than a distribution board. Rated breaking capacity hits 30 kA at 400 V, so it clears bolted faults up to that level without requiring an upstream fuse or larger breaker — useful for panels with high available fault current. Motor horsepower ratings span from 5 hp at 110/120 V up to 40 hp at 460/480 V, covering a wide range of common industrial motor sizes.
Panel integration and mounting
Mounts via screw or snap-on onto 35 mm DIN rail per DIN EN 60715 — the standard rail in every control panel, so no adapter plate needed. Width of 55 mm and depth of 149 mm mean it occupies one standard modular slot; plan for 50 mm clearance above and below, 10 mm to the side, and zero forwards or backwards. Main circuit terminals accept 2x 1–35 mm² or 1x 1–50 mm² solid or stranded copper — enough for the motor feed cable on a 40 hp load.
Lifecycle and sourcing
The lifecycle stage is listed as current — meaning Siemens still actively manufactures and supports this order code. No end-of-life notice or last-time-buy window is in effect.