The Siemens SIRIUS 3RV2011-1KA15-ZX95 is a motor protection circuit breaker designed for Class 10 trip coordination, meaning it clears a stalled-rotor condition before the motor insulation reaches its thermal limit — standard for standard-duty induction motors driving pumps, fans, and compressors. Rated short-circuit breaking capacity hits 100 kA at 400 V, so it safely interrupts a bolted fault at the motor terminals without requiring an upstream current-limiting fuse for most industrial service-entrance panels. Integrated phase failure detection trips the breaker on loss of one line — critical for preventing single-phasing damage on delta-connected motors.
Mounting and panel fit
Fastens via screw and snap-on onto 35 mm DIN rail per DIN EN 60715. The 45 mm width occupies one standard 45 mm module slot; 97 mm depth leaves clearance for wiring ducts. Mounting position any — installs horizontally or vertically without derating the trip curve. Terminals accept 2x (0.5…1.5 mm²) solid or stranded, or 2x (0.75…2.5 mm²) — sized for standard motor interposing relay wiring.
Breaking capacity by voltage
At 690 V the breaker still clears 4 kA — sufficient for most 690 V motor branch circuits in European or Canadian installations, though the 100 kA at 400 V is the headline figure for 400 V class panels. gL/gG fuse-limit ratings: 63 A at 400 V, 50 A at 500 V, 40 A at 690 V — coordinate with upstream fuse selection for full selectivity.