Motor protection circuit breaker, 3.2 A, CLASS 10 — SIRIUS series
The Siemens 3RV1021-1DA10-ZX95 is a SIRIUS motor protection circuit breaker rated for 3.2 A continuous current and 1.1 kW motor load at 400 V AC-3. Its CLASS 10 trip characteristic means it clears overloads within 10 seconds at 7.2× rated current — fast enough to protect standard induction motors during locked-rotor conditions without nuisance tripping on normal starts. Breaking capacity sits at 100 kA at 240 V, 400 V, and 500 V AC, dropping to 8 kA at 690 V AC. That 100 kA figure at 400 V gives headroom for high-fault panels without cascading upstream breakers — a common requirement in industrial MCCs. Phase failure detection is built in, so the breaker trips on loss of one line — critical for preventing single-phasing damage on delta-connected motors. No ground fault detection on this variant.
Mounting and wiring — DIN rail, screw terminals
Snap-on mounting onto 35 mm standard rail per DIN EN 50022. Width is 45 mm, height 97 mm, depth 96 mm — fits a standard 45 mm-wide slot in the panel layout. Any mounting position allowed. Main circuit uses screw-type terminals accepting 2x (1 … 2.5 mm²) solid or stranded, and 2x (2.5 … 6 mm²) solid or stranded. AWG equivalent 2x (14 … 10) for the main contacts. Zero clearance needed at the back or sides — 0 mm backwards and 0 mm at the side. Power dissipation at rated current in hot state: 7.25 W total, 2.4 W per pole. Factor that into enclosure thermal calculations — at 3.2 A it's modest, but the per-pole figure matters for derating in sealed cabinets.