Motor protection circuit breaker for the panel build
The Siemens SIRIUS 3RV1011-1CA10-ZW95 is a motor protection circuit breaker designed to protect motor feeders against overload, short-circuit, and phase failure. It carries a Trip Class 10, meaning it trips within 10 seconds at 7.2× the thermal setting — fast enough to protect standard induction motors during locked-rotor conditions. The breaker is rated for a breaking capacity of 100 kA at 400 V, which covers most industrial panel fault levels without needing an upstream current-limiting fuse. It mounts on a 35 mm DIN rail per DIN EN 60715 and accepts screw-type terminals for the main circuit.
What the key ratings mean for your BOM line
The 100 kA breaking capacity at 400 V means this breaker can safely interrupt a short-circuit fault up to that level without needing an upstream fuse for most installations — a key spec for panel SCCR compliance. The Trip Class 10 is the standard for general-purpose motor starting; it allows the inrush current to pass during start-up but clears quickly on a sustained overload. Phase failure detection is built in, so the breaker will trip if one phase drops out, preventing single-phasing damage to the motor. The 45 mm width and 75 mm depth fit the standard SIRIUS compact footprint, leaving room for auxiliary contact blocks alongside.
Panel integration and wiring
The breaker snaps onto a 35 mm DIN rail (DIN EN 60715) in any mounting position. The main circuit uses screw-type terminals accepting 2x (0.5 to 1.5 mm²) solid or stranded, or 2x (0.75 to 2.5 mm²). Clearance: 20 mm upwards and downwards, 9 mm at the side, 0 mm forwards and backwards. No separate fuse is required at 240 V; at 400 V a gL/gG 35 A backup fuse is specified.