The Siemens SIRIUS 3RV1011-1FA20-ZW97 is a motor-protective circuit breaker rated for 5 A continuous current with a CLASS 10 trip characteristic, sized for a 1.5 kW motor at 400 V. It delivers 100 kA breaking capacity at both 240 V and 400 V AC, dropping to 3 kA at 500 V and 2 kA at 690 V — so on a 400 V line it handles high fault currents without cascading upstream. The main circuit connects via spring-loaded terminals, and the unit snaps onto a 35 mm DIN rail per EN 50022.
Trip class and motor protection
CLASS 10 means the breaker trips within 10 seconds at 7.2× the thermal setting — standard for protecting general-purpose induction motors driving pumps, fans, and conveyors. Phase failure detection is built in, so a lost phase on the line won't let the motor single-phase to destruction.
Panel fit and wiring
Width is 45 mm, height 90 mm, depth 81 mm — a compact footprint for a 3-pole breaker with an integrated auxiliary switch. The spring-loaded terminals accept 2× (0.25 to 2.5 mm²) solid or 2× (0.25 to 1.5 mm²) finely stranded with ferrule, or 2× (24 to 14 AWG). Mount any position; clearance zero at the sides and rear, so it packs tight against adjacent devices on the rail.
Breaking capacity and selectivity
Rated surge voltage resistance is 6 kV. The 100 kA breaking capacity at 400 V means this breaker can be used in high-fault installations without needing a current-limiting upstream device — useful for panel builders coordinating with a transformer or main breaker. At 690 V the capacity drops to 2 kA, so verify the available fault current if running at that voltage.