The Siemens SIRIUS 3RV1011-1KA20-ZX95 is a motor protection circuit breaker rated for 12 A continuous current and 5.5 kW at 400 V, with a CLASS 10 trip characteristic — meaning it clears overloads fast enough to protect standard induction motors during start-up without nuisance tripping on normal inrush. Breaking capacity sits at 100 kA at 240 V AC and 50 kA at 400 V AC, then drops to 3 kA at 500 V and 2 kA at 690 V — so for most 400 V line-side faults this breaker clears high-energy arcs without upstream coordination issues. The main circuit uses spring-loaded terminals accepting 2x (0.25... 2.5 mm²) solid or 2x (0.25... 1.5 mm²) finely stranded with ferrule.
Width is 45 mm, height 90 mm, depth 81 mm — fits a standard 45 mm module slot. IP20 on the front; no IP rating on the sides or back, so panel enclosure provides the environmental seal. Shock rated at 25g / 11 ms. Mounting position any.