The Siemens 3RV1021-4CA10-ZW96 is a SIRIUS motor protection circuit breaker rated for 22 A continuous current and 11 kW at 400 V AC-3.
Snaps onto 35 mm DIN rail per EN 50022; screw-type terminals on both main and auxiliary circuits accept 2× (1 … 2.5 mm²) solid or stranded, or 2× (2.5 … 6 mm²) — covers the range from control wiring to motor feeder tails. Depth is 96 mm, width 45 mm, so it occupies a single 45 mm module on the rail.
Phase failure and auxiliary switch
Built-in phase-failure detection trips the breaker if one phase drops out — critical for three-phase motor loads where single-phasing can burn a winding in minutes. No ground-fault detection on this variant.
