What it is and what it does
The Siemens 3RV1011-0GA25 is a SIRIUS motor protection circuit breaker designed for motor protection. It carries a continuous current rated value of 0.63 A and a CLASS 10 trip class, meaning it will trip within 10 seconds at 7.2× rated current — fast enough to protect standard induction motors against locked-rotor conditions without nuisance tripping during normal start-up. Rated motor power is 0.18 kW at 400 V AC, which sizes this breaker for fractional-horsepower drives like small pumps, fans, or conveyor motors on a 400 V three-phase line. The breaking capacity holds at 100 kA across the full voltage range: 240 V, 400 V, 500 V, and 690 V AC — that is a high-fault rating that keeps the panel coordinated even on a stiff industrial supply.
Mounting and integration
Mounts via screw or snap-on onto a 35 mm standard mounting rail per DIN EN 50022. The 45 mm width and 90 mm height fit a standard 45 mm module slot; depth is 81 mm, which leaves clearance in most 200 mm deep enclosures. Spring-loaded terminals on the main current circuit accept 2x (0.25... 2.5 mm²) solid or stranded — no lug crimping needed for the power wires. Mounting position is any, which simplifies layout in tight panels. IP20 on the front means finger-safe when installed in a closed enclosure; no washdown rating, so keep it inside the cabinet.
Key ratings and what they mean for fit
Phase failure detection is built in — the breaker trips if one phase drops out, preventing single-phasing damage to the motor. Auxiliary switch is present (transverse design) for remote status feedback to a PLC or indicator light. The mechanical switching frequency at AC-3 duty is rated at a maximum of 15 operations per hour, which suits intermittent starting applications like conveyor indexing or batch mixing — not continuous jogging. Power dissipation in hot operating state is 5.5 W at AC — negligible for thermal budget in a standard steel enclosure. Mechanical endurance of the main contacts is typical 100,000 operations, matching the service life of the equipment it protects.