Motor protection circuit breaker for Class 10 trip curves
The Siemens 3RV2011-1CA25 is a SIRIUS motor protection circuit breaker designed to protect induction motors against overload and short-circuit conditions. Its Class 10 trip characteristic means it will trip within 10 seconds at 7.2× the thermal setting — fast enough to protect a motor winding during a locked-rotor event without nuisance tripping on normal starting inrush, which is the spec that decides fit for compressor or pump starts. Rated for a supply voltage range of 20 to 690 V, this breaker delivers a short-circuit breaking capacity of 100 kA at 400 V and 500 V, and 10 kA at 690 V. At 400 V, the gL/gG fuse backup rating is 25 A. That SCCR headroom means it can be applied on high-fault-capacity distribution panels without cascading upstream — a key coordination point for the site electrical engineer. Phase failure detection is built in, so the breaker will trip if one phase drops out during running — preventing single-phasing damage on a motor. No ground fault detection on this variant.
DIN rail integration and wiring
Mounts via screw or snap-on onto 35 mm DIN rail per DIN EN 60715, in any orientation. Dimensions are 97 mm deep, 45 mm wide, and 106 mm tall. Clearance requirements: 50 mm upwards and downwards, 30 mm to the side. That 45 mm width means it occupies one standard 45 mm module slot on the rail — a direct fit for existing SIRIUS panels without re-spacing. Main circuit connections use spring-loaded terminals accepting 2× (0.5 to 2.5 mm²) solid or stranded wire. No screw torque to verify — just strip to the right length and push in. The spring cage holds the conductor under vibration, which matters on a machine-side panel near a press or conveyor.
Environmental and compliance
Operating temperature range is -20 to +60 °C; storage and transport range is -50 to +80 °C. The breaker can be stored in unheated warehouses and still perform when pulled for a line-down swap.