What this breaker is and what it does
The Siemens 3RV1011-1CA10-ZW98 is a SIRIUS motor protection circuit breaker designed to protect motor branch circuits against overload and short circuit. Its CLASS 10 trip class means it will trip within 10 seconds at 7.2× the thermal setting — fast enough to protect a standard induction motor during a locked-rotor condition without nuisance tripping on normal starts. It includes phase failure detection, so if one leg drops out the breaker opens before single-phasing cooks the motor. No ground fault detection here — that's a separate device if you need it. Rated operating voltage spans 20 to 690 V AC, which covers everything from 24 V control transformers up to 690 V industrial mains. The rated short-circuit breaking capacity hits 100 kA at 400 V, meaning it can safely interrupt fault currents up to that level without welding contacts or rupturing the case — important for high-fault-capacity panels common in heavy industrial settings. At 690 V it's still rated for 2 kA, so it handles the higher voltage but with reduced fault-handling ability.
DIN-rail fit and panel clearance
Mounts via screw or snap-on onto standard 35 mm DIN rail per DIN EN 60715. The 45 mm width means it takes up a single modular slot — no wider than a typical miniature circuit breaker, so it fits neatly in a crowded enclosure. Depth is 75 mm from the rail back, and the breaker requires 20 mm clearance above and below for wiring and heat dissipation, but zero clearance forward or backward. Side clearance is only 9 mm. That tight envelope means you can pack multiple units side by side without derating, as long as ambient stays under 60 °C during operation. Terminals are screw-type for the main circuit, accepting up to 2x 2.5 mm² solid or stranded. The M3 contact screws are standard — any electrician's screwdriver fits. Mounting position is any orientation, so it works in horizontal busbar layouts or vertical panel arrangements without derating the thermal trip.