What it is and what it does
The Siemens 3RV2332-4DC10 is a SIRIUS circuit breaker designed specifically for starter combinations — meaning it integrates motor protection and disconnection in one device, sized to coordinate with a contactor in a motor starter assembly. Its headline number is the 50 kA breaking capacity at 400 V AC — that is the fault current it can safely interrupt without welding contacts or cascading the fault upstream in the panel. At 690 V the rated short-circuit breaking capacity is 5 kA, and at 240 V it reaches 100 kA, so the part's real-world interrupting rating depends on which line voltage your installation uses.
Sizing for motor loads
This breaker carries motor horsepower ratings across common North American and IEC voltage bands: 5 hp at 230 V, 10 hp at 220/230 V, 20 hp at 460/480 V, and 7.5 hp at 200/208 V. Those ratings tell you the maximum induction motor it can protect at those voltages — useful when filling a BOM line for a pump or conveyor drive section.
Mounting and panel fit
Mounts via screw fixing or snap-on onto 35 mm standard mounting rail per DIN EN 60715, in any orientation. Dimensions are 55 mm wide, 140 mm high, 149 mm deep — that depth is the body plus terminal clearance, so check your gland plate depth before committing the panel layout. Clearance requirements: 50 mm above and below, 10 mm to the sides, zero forward or backward — tight enough for dense DIN-rail rows if you respect the thermal zone.
Termination and wiring
Main circuit connections are screw-type terminals accepting 2x (1 to 35 mm²) or 1x (1 to 50 mm²) solid or stranded copper — M6 stud size on the main contacts.