What it is and what it does
The Siemens 3RV2011-1HA40 is a SIRIUS motor protection circuit breaker designed for motor protection in industrial control panels. It's a Trip Class 10 device, meaning it will trip within 10 seconds at 7.2× the thermal setting current — fast enough to protect standard induction motors during a locked-rotor event without nuisance tripping on normal starts. Rated breaking capacity hits 100 kA at both 240 V and 400 V — that's the fault current it can safely interrupt without welding contacts or cascading upstream. For a panel fed from a 400 V transformer with high available fault current, this breaker can sit right at the motor feeder without needing a current-limiting fuse ahead of it. Phase failure detection is built in. If one phase drops on a three-phase motor, the breaker will trip — prevents single-phasing damage that cooks windings. No ground fault detection on this variant, so if you need that, look at the GF versions in the same SIRIUS family.
Mounting and integration
Mounts via screw and snap-on onto 35 mm standard mounting rail per DIN EN 60715. Any mounting position is acceptable. The 45 mm width and 97 mm depth mean it occupies a standard 2-module width on the DIN rail — plan your enclosure fill factor accordingly. Clearance requirements: 50 mm upwards and downwards, 30 mm at the sides, zero forwards and backwards. That's the breathing room for arc flash venting and cable bending — don't cram it tighter in a gland plate layout. Main circuit connection uses ring cable lug, screw size M3. Wire it with the right lug for your cable cross-section — don't wrap bare wire around the terminal.
Environmental and lifecycle
Operating temperature range -20 to +60 °C, storage and transport -50 to +80 °C. Temperature compensation is active across the operating range — the thermal trip curve stays accurate even if the panel ambient drifts. That matters in a cement plant control room that hits 50 °C in summer; this breaker eats the dust and runs.