SIRIUS 3RV1021-1EA10-0FJ0-ZX95 — Motor Protection Circuit Breaker, 4 A, Class 10
The Siemens SIRIUS 3RV1021-1EA10-0FJ0-ZX95 is a three-pole motor protection circuit breaker with a thermomagnetic overcurrent and short-circuit release, rated for a continuous current of 4 A and a motor power of 1.5 kW at 400 V. Its Class 10 trip characteristic means it will trip within 10 seconds at 7.2× the thermal setting — the standard for protecting standard induction motors during start-up, where the inrush current decays before the trip curve crosses. Breaking capacity is 100 kA at 240 V, 400 V, and 500 V AC, dropping to 6 kA at 690 V AC — the high 100 kA figure at common distribution voltages (400 V) means this breaker can be used in high-fault-current panels without needing a current-limiting upstream device, simplifying selectivity coordination. Mounts via screw or snap-on onto 35 mm standard rail per DIN EN 50022, in any position, with a 45 mm width that occupies one standard 45 mm module slot — panel layout is straightforward.
Integration Notes
Depth is 96 mm, height 97 mm — the 96 mm depth is within the standard 100 mm deep enclosure profile, so it clears most shallow gland plates without a spacer. Phase failure detection is built in, so the breaker will trip on loss of any one phase — important for preventing single-phasing damage on delta-connected motors. No ground-fault detection on this variant; if GF is required, specify the -Z suffix options or an external module. Screw terminals on both main and auxiliary circuits; main terminals accept 2×(1…2.5 mm²) or 2×(2.5…6 mm²) solid/stranded — double-ferrule terminations are fine. The auxiliary switch option is available but this specific order code ships without auxiliary contacts (0 CO,). Rated operational voltage is 690 V AC, with an AC-3 motor switching rating of 4 A at 400 V and a maximum operating frequency of 15 operations per hour — sized for occasional motor starts, not high-duty cycling.