What this SIRIUS motor-protective circuit breaker delivers
The Siemens 3RV2011-1DA20-ZX95 is a SIRIUS motor-protective circuit breaker designed for motor protection, with a Trip Class CLASS 10 rating — meaning it trips within 10 seconds at 7.2× the thermal setting, fast enough to protect standard induction motors during locked-rotor starts without nuisance tripping on normal acceleration. It offers a gL/gG fuse backup rating of 25 A at 400 V and 690 V, and 32 A at 500 V, so the upstream fuse coordinates with the breaker's magnetic trip to clear high faults. Breaking capacity hits 100 kA at 240 V, 400 V, and 500 V, dropping to 10 kA at 690 V — sufficient for most industrial panel secondary-side faults. Phase failure detection is built in, so a lost phase on the line side will trip the breaker rather than letting the motor single-phase and overheat. The main circuit connects via spring-loaded terminals, accepting 2x (0.5 to 4 mm²) solid or stranded wire — no screw torque to verify, just strip and push.
Panel fit and DIN-rail integration
Width is 45 mm, depth 97 mm, height 106 mm — a standard 45 mm module that occupies one slot on a 35 mm DIN rail per DIN EN 60715, with screw and snap-on fastening. Mounting position is any, so you can orient it horizontally in a shallow enclosure or vertically in a tall one without derating the thermal trip. Clearance requirements: 50 mm upwards and downwards, 30 mm at the side, 0 mm forwards and backwards — meaning the breaker can sit flush against the back panel and the door, but needs breathing room above and below for arc exhaust and wiring access. Operating temperature range is -20 to +60 °C, storage and transport -50 to +80 °C, so it handles unheated warehouses and truck-bed freeze cycles without issue.
Sourcing and lifecycle status
Maximum switching frequency under AC-3 duty (motor starting) is 15 operations per hour, and the same limit applies under AC-3e — so it's sized for occasional starts, not a jogging or inching application.