Motor protection circuit breaker — SIRIUS 3RV1011-0KA10-ZW95
The Siemens SIRIUS 3RV1011-0KA10-ZW95 is a motor protection circuit breaker designed for motor protection, with a Class 10 trip curve that matches standard induction motor start profiles — it holds through the inrush without nuisance tripping, then clears on sustained overload within 10 seconds at 7.2× Ie. Rated breaking capacity hits 100 kA at 240 V, 400 V, and 500 V, which means it can safely interrupt fault currents up to that level without cascading upstream — critical for panel SCCR compliance in high-fault installations. Mounts via screw and snap-on onto 35 mm DIN rail per DIN EN 60715, with a 45 mm width that fits standard enclosure rail spacing. Any mounting position is allowed, simplifying layout in tight panels.
Protection features and wiring
Built-in phase failure detection protects motors against single-phasing — a common failure mode in three-phase lines that can burn out windings if undetected. No ground fault detection, so if that's required, add an external GF relay. Main circuit terminals accept screw-type connections, rated for 2× (0.5…1.5 mm²) solid or stranded, or 2× (0.75…2.5 mm²). Torque spec for M3 screws — standard for this class. Maximum switching frequency in AC-3 duty is 15 operations per hour — fine for pump and conveyor cycling, but not for high-repetition applications like stamping presses.