Motor protection circuit breaker with Trip Class 10 and 100 kA breaking capacity
The Siemens SIRIUS 3RV2011-0KA10-ZW97 is a motor protection circuit breaker designed to protect induction motors against overload, short-circuit, and phase failure. Its Trip Class 10 rating means it will trip within 10 seconds at 7.2× the thermal setting current — fast enough to protect standard squirrel-cage motors during a locked-rotor event without nuisance tripping on normal starting inrush. The 100 kA breaking capacity at 400 V AC and at 240 V, 500 V, and 690 V means this breaker can safely interrupt fault currents up to that level without upstream fuses or a larger breaker — a key spec for high-fault-capacity industrial panels where the available short-circuit current at the motor starter exceeds 50 kA. Phase failure detection is built in, so the breaker will trip if one phase drops out — preventing single-phasing damage to the motor winding. The 45 mm width and 97 mm depth fit the standard SIRIUS 3RV2 footprint, and the screw and snap-on mounting onto 35 mm DIN rail per DIN EN 60715 means it clips directly into a panel alongside contactors and overload relays without extra brackets.
Mounting and integration into a motor starter panel
Mounting position is any, so the breaker can be oriented vertically, horizontally, or flat — useful when panel layout forces a non-standard orientation. The screw-type terminals on the main current circuit accept 2× (0.75 to 2.5 mm²) solid or stranded, or 2× 4 mm², with M3 screws for the main contacts. Clearance distances: 50 mm upwards and downwards, 30 mm at the side, 0 mm forwards and backwards — the zero forward/backward clearance means it can be mounted flush against a backplate or enclosure wall without derating.