What this breaker does in a panel
The Siemens 3RV2011-1AA20-ZW96 is a SIRIUS motor protection circuit breaker designed to protect motor branch circuits against overload and short-circuit. It combines a Class 10 trip curve with phase failure detection, so it clears a single-phased motor before the winding overheats — a common failure mode on conveyor drives and pump stations. The 100 kA breaking capacity at 400 V AC means it safely interrupts faults up to that level without cascading upstream, which simplifies coordination in a distribution panel. It mounts on 35 mm DIN rail per DIN EN 60715, either snapped on or screwed, and accepts spring-loaded terminals for the main circuit.
Trip class and protection logic
Trip Class 10 means the breaker trips within 10 seconds at 7.2× the thermal setting — fast enough to protect a standard induction motor during a stalled-rotor condition. Phase failure detection is built in, so a lost phase on a three-phase line triggers a trip even if the load current stays below the overload threshold. Ground fault detection is not included; if that's required, pair this breaker with a separate ground-fault relay or choose a SIRIUS variant with the GF module.
DIN rail fit and spacing
The breaker occupies 45 mm width on the DIN rail, with a depth of 97 mm and height of 106 mm. Clearance requirements: 50 mm above and below, 30 mm to the side, and zero forward or backward clearance needed. Mounting position is any orientation. These numbers matter when laying out a dense panel — the 45 mm width matches the standard SIRIUS 3RV2 footprint, so it drops into the same slot as other 3RV2011 variants without re-drilling the gland plate.