What it is and what it does
The Siemens 3RV2011-1EA10-ZX95 is a SIRIUS motor protection circuit breaker designed to protect motors against overload, short-circuit, and phase failure. Its Trip Class 10 means it will trip within 10 seconds at 7.2× the thermal setting current, which is the standard for standard-duty motor starting — it handles normal acceleration without nuisance tripping but clears a stalled rotor fast enough to protect the winding insulation. Rated for 100 kA short-circuit breaking capacity at 240 V, 400 V, and 500 V, this breaker can be installed on high-fault-current panels without needing upstream current-limiting fuses in most industrial distributions. At 690 V the SCCR drops to 4 kA, so on 690 V systems verify the available fault current stays below that. Phase failure detection is built in — if one phase drops out, the breaker trips, preventing single-phasing damage to the motor. No ground fault detection on this variant.
Where it goes and how it mounts
Mounts via screw fixing or snap-on onto 35 mm DIN rail per DIN EN 60715. The 45 mm width (three 15 mm modules) fits standard enclosure rail spacing. Any mounting position is allowed, which simplifies layout in crowded panels. Dimensions are 97 mm high × 45 mm wide × 97 mm deep. Clearance requirements: 50 mm above and below, 30 mm to the sides, 0 mm forward and backward — so it can be packed tightly front-to-back against a backplate or busbar.