The Siemens SIRIUS 3RV2011-1AA25-ZX95 is a motor protection circuit breaker, designed specifically for protecting motor circuits against overloads and short circuits. It mounts onto a standard 35 mm DIN rail per DIN EN 60715, using either screws or a snap-on mechanism, making it a direct fit for most European-style control panels. Its Class 10 trip characteristic means it will disconnect within 10 seconds at 7.2x the thermal setting, which is the standard for standard-duty induction motors — pumps, fans, and compressors that don't need an ultra-fast trip. The 100 kA breaking capacity at 400 V and 690 V gives it the headroom to sit upstream of a motor starter without needing a separate backup fuse, simplifying the panel layout. Phase failure detection is built in, so it will drop the load if one line drops out — a common cause of single-phasing motor burnouts. The spring-loaded terminals on the main circuit accept 2x (0.5...2.5 mm²) solid or stranded wire, which is the standard range for control wiring in this class.
Mounting and Clearances
At 45 mm wide and 97 mm deep, it occupies a single 45 mm slot on the DIN rail. The mounting position is any orientation, which helps when laying out a dense panel. Required clearances: 50 mm above and below, 30 mm to the side, and 0 mm forward/backward — meaning it can be packed tight against the back panel or enclosure door.
Auxiliary Contact Ratings
The auxiliary contact block handles 1 A at 24 V, 0.5 A at 120/125/230 V, and 0.15 A at 60 V. These are the standard signal-level ratings for feeding a PLC input or a contactor coil — not for power switching.