What it is and what it does
The Siemens SIRIUS 3RV2011-1GA20-ZW96 is a motor protection circuit breaker designed to protect induction motors against overload and short-circuit. It carries a CLASS 10 trip class, meaning it will trip within 10 seconds at 7.2× the thermal setting — fast enough to protect a motor winding during a stall or locked-rotor event without nuisance tripping on normal starting inrush. Phase failure detection is built in, so a lost phase on the line side will drop the load before single-phasing damages the motor. Rated breaking capacity hits 100 kA at 400 V and 100 kA at 240 V, which covers most industrial service-entrance and sub-distribution fault levels without needing a current-limiting upstream fuse. At 690 V the interrupting rating drops to 4 kA — still adequate for most 690 V motor circuits, but worth verifying against the available fault current if the panel feeds a 690 V bus.
Mounting and integration
Mounts via screw or snap-on onto 35 mm standard mounting rail per DIN EN 60715. The 45 mm width and 97 mm depth fit a standard 8-module DIN-rail footprint — one slot, no overhang. Spring-loaded terminals on the main circuit accept 2×(0.5…4 mm²) solid or stranded, so no ferrule crimping needed for the motor leads. Mounting position is any; clearance requirements: 50 mm upwards, 50 mm downwards, 30 mm at the side, zero forwards or backwards.