What it is and where it lands
The Siemens 3RV2332-4PC10 is a SIRIUS 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 a panel row compared to a separate MCCB plus overload relay. It mounts via screw and snap-on onto a 35 mm standard mounting rail per DIN EN 60715, in any position, so it fits both new builds and retrofit panels where the rail pattern is already punched.
Breaking capacity — what the numbers mean for coordination
The 3RV2332-4PC10 carries a breaking capacity of 100 kA at 240 V, 50 kA at 400 V, 8 kA at 500 V, and 4 kA at 690 V. These are the maximum fault currents it can safely interrupt at each voltage level without welding contacts or cascading failure upstream. For a 400 V panel with a transformer rating that yields a prospective short-circuit current of, say, 35 kA, this breaker sits comfortably within its 50 kA rating — no need to oversize the upstream feeder breaker for selectivity.
Panel integration — clearances and terminal work
Dimensions are 149 mm deep, 55 mm wide, and 140 mm tall. Required clearances: 50 mm above and below the device, 10 mm to the side, and zero forward or backward clearance. That zero forward clearance means it can sit flush against a gland plate or back panel without derating. Main circuit terminals accept 2x 1–35 mm² or 1x 1–50 mm² solid or stranded copper, with M6 screw terminals.
Environmental range
Operating temperature spans -20 to +60 °C; storage and transport range is -50 to +80 °C. The wide storage range matters for site trailers or unheated warehouses — the breaker can sit through a winter freeze without damage as long as it's not powered.