Motor protection circuit breaker for the critical path
The Siemens SIRIUS 3RV2011-1CA10-ZW96 is a motor protection circuit breaker designed to sit between your feeder and the motor starter — it combines short-circuit and overload protection in one 45 mm wide package that snaps onto 35 mm DIN rail per DIN EN 60715. Rated breaking capacity hits 100 kA at 400 V, which means it can safely interrupt a fault current up to that level without needing an upstream fuse or breaker to clear first — that's your selectivity headroom for a distribution panel feeding multiple motor branches. Trip Class 10 means it disconnects within 10 seconds at 7.2× the thermal setting — fast enough to protect standard induction motors during a stall or locked-rotor event without nuisance tripping on normal starts. Phase failure detection is built in, so a lost phase on the line side drops the load before single-phasing cooks the winding.
Dimensional fit and mounting
The cube measures 97 mm high by 97 mm deep by 45 mm wide — that 45 mm width is the same as a standard single-pole MCB footprint, so it fits in a typical motor control center bucket without crowding adjacent devices. Mounting position is any orientation, and the screw-and-snap-on fastening means you can pre-wire the panel and clip the breaker in during commissioning without removing the terminals. Clearance requirements: 50 mm upwards and downwards, 30 mm to the sides, zero forwards or backwards — that's the minimum air gap for arc quenching and thermal dissipation.
Termination and wiring
Main current circuit uses screw-type terminals sized for M3 screws, accepting 2×(0.75–2.5 mm²) solid or stranded, or a single 4 mm² conductor per clamp. The gL/gG fuse coordination at 400 V and 500 V is 25 A, dropping to 20 A at 690 V — that's the maximum backup fuse rating if you need to coordinate with a downstream short-circuit device.