The Siemens 3RV2332-4UC10 is a SIRIUS circuit breaker designed specifically for starter combinations — the kind you'd find protecting a motor branch circuit inside a panel. It's rated for a breaking capacity of 50 kA at 400 V, meaning it can safely interrupt a fault current of that magnitude without welding its contacts or cascading the arc upstream. That's the number that decides whether this breaker coordinates with your existing distribution gear, not just the motor full-load amps.
Mounting and integration
Snaps onto a 35 mm DIN rail per DIN EN 60715, or you can screw-mount it. The 55 mm width means it takes up one standard modular slot — a detail the panel builder will appreciate when they're laying out the gland plate. Any mounting position works, so you're not forced into a specific orientation. Terminal screws are M6 for the main circuit, accepting up to 2x 35 mm² or 1x 50 mm² solid or stranded copper.
Breaking capacity across voltages
The interrupting rating drops as voltage climbs: 100 kA at 240 V, 50 kA at 400 V, 8 kA at 500 V, and 4 kA at 690 V. That's typical for a current-limiting breaker — the arc energy grows with voltage, so the same mechanism can't clear as much fault current. For a 480 V panel, the 50 kA at 400 V figure is the one to coordinate against; at 690 V you're down to 4 kA, which may force a larger upstream fuse if the available fault current is higher.