The Siemens SIRIUS 3RV1011-0GA20-ZX95 is a motor protection circuit breaker rated for 0.63 A continuous current with a Class 10 trip characteristic — that means it clears overloads fast enough to protect standard induction motors during start-up without nuisance tripping on inrush. The 100 kA breaking capacity at 400 V AC holds across the full voltage range up to 690 V, so it handles high fault-current scenarios without cascading upstream. Phase failure detection is built in, which is critical for three-phase motor protection — if you lose a phase, the breaker trips rather than letting the motor single-phase and burn. Main contacts terminate via spring-loaded terminals, accepting 2x (0.25... 2.5 mm²) solid or 2x (0.25... 1.5 mm²) finely stranded with ferrule. Mounts on 35 mm DIN rail per EN 50022 with screw and snap-on; IP20 on the front keeps fingers out of the live terminals in an enclosed panel.
Dimensional fit and panel integration
The 3RV1011-0GA20-ZX95 occupies 45 mm width, 90 mm height, and 81 mm depth. That 81 mm depth is the dimension that matters when you're slotting it into a shallow enclosure or a backpanel with wiring duct behind it — verify the clearance behind the rail before committing the layout. Mounting position is any orientation, and zero clearance is required at the sides or rear, so you can pack breakers tight on the rail. The 45 mm width matches the standard SIRIUS 3RV1 footprint — drops into the same slot as the 3RV1011-0GA10 without re-drilling or moving adjacent components.
Environmental and electrical margins
Operating temperature range is -20 to +60 °C; storage and transport handle -50 to +80 °C. Shock rated at 25 g for 11 ms — survives the ride to site and the occasional panel door slam. Surge voltage resistance is 6 kV, which covers the impulse withstand for 400 V class installations per IEC 60947-2. Power dissipation at rated current is 5.5 W total, 1.8 W per pole — negligible for panel thermal budgeting at this 0.63 A level.