The Siemens SIRIUS 3RV2021-1GA10-ZW96 is a motor protection circuit breaker designed for Class 10 trip response — meaning it disconnects within 10 seconds at 7.2× the thermal setting, fast enough to protect standard induction motors from locked-rotor heating without nuisance tripping on start-up transients. Rated breaking capacity hits 100 kA at 400 V AC, so this breaker can safely interrupt fault currents up to that level without upstream fuses or cascading — a key spec for high-SCCR panel designs where the available fault current is known to be high. Mounts on 35 mm DIN rail per DIN EN 60715, either snap-on or screw-fixed, and fits a 45 mm width slot — standard for a three-pole motor-protective device in a distribution board or motor control center.
Integration Notes
Screw-type terminals on the main circuit accept 2x (1…2.5 mm²) solid or stranded, or 2x (2.5…10 mm²) — sized for standard motor feeder cables up to 10 mm² without lug adapters. Mounting position is any orientation; clearance above and below is 50 mm, zero at the sides and front/back — tight panel layouts work as long as the 50 mm vertical breathing zone is respected. Phase failure detection is built in — the breaker trips on loss of any phase, which is standard for motor protection in three-phase systems where single-phasing can burn out a winding.