The Siemens 3RV1011-1CA20-ZW97 is a SIRIUS motor protection circuit breaker rated for 2.5 A continuous current, with a CLASS 10 trip characteristic, sized for a 0.75 kW motor at 400 V three-phase. It carries a 100 kA breaking capacity at 400 V AC, which means it can interrupt a fault up to that level without upstream fuses needing to clear — useful for high-fault panels where you want to keep selectivity simple. Three poles, spring-loaded terminals on both main and auxiliary/control circuits, and it mounts on a 35 mm DIN rail per EN 50022 with screw or snap-on. The IP20 front means it's finger-safe for panel builders working live.
Trip class and motor protection
CLASS 10 trip means it will disconnect within 10 seconds at 7.2× the current setting — that's the standard for standard induction motors starting direct-on-line. It includes phase failure detection, so if you lose a phase on a lightly loaded motor, the breaker trips rather than letting the motor single-phase and burn. Rated operating frequency is 15 operations per hour maximum at AC-3 duty, which covers most conveyor and pump starts but not frequent jogging or reversing cycles.
Mounting and wiring
Width is 45 mm, depth 81 mm, height 90 mm — fits a standard 45 mm wide DIN-rail slot. Backwards clearance is 0 mm, so it can sit flush against the back panel. Any mounting position is allowed, which simplifies layout in tight enclosures. Spring-loaded terminals accept 2x (0.25 to 2.5 mm²) solid or 2x (0.25 to 1.5 mm²) finely stranded with ferrules. AWG equivalent is 2x (24 to 14). No screw torque to worry about — strip and push.
Environmental and compliance
Operating temperature range is -20 to +60 °C; storage and transport range is -50 to +80 °C. Shock rated at 25g for 11 ms. Surge voltage resistance is 6 kV, which covers most industrial mains transients.