Motor Protection Circuit Breaker – 1 A, Class 10, 100 kA
The Siemens 3RV1021-0JA15 is a SIRIUS motor protection circuit breaker designed for motor loads up to 0.25 kW at 400 V AC-3 duty, with a continuous current rating of 1 A and Trip Class 10 thermal protection. Trip Class 10 means the breaker trips within 10 seconds at 7.2× the rated current — fast enough to protect standard induction motors from locked-rotor heating without nuisance tripping during normal start-up. Breaking capacity is 100 kA across the full AC voltage range (240 V through 690 V), so it safely interrupts high fault currents without cascading to upstream devices. Phase failure detection is built in — the breaker responds to loss of one phase, preventing single-phasing damage on the motor.
Panel Integration and Mounting
Mounts via screw or snap-on onto 35 mm standard mounting rail per DIN EN 50022, in any orientation. Dimensions: 45 mm wide, 97 mm high, 96 mm deep — fits standard control-panel layouts with no side clearance required. IP20 protection on the front allows installation in enclosed panels where no water ingress is expected. Screw-type terminals on main and auxiliary circuits accept solid conductors 2x (0.5–1.5 mm²) and 2x (0.75–2.5 mm²), or stranded 2x (1–2.5 mm²) and 2x (2.5–6 mm²). AWG equivalents for main contacts: 2x (14–10).
Lifecycle and Sourcing
The SIRIUS series includes other motor protection breakers with different current ratings (e.g., 3RV1011-0HA10, 3RV1011-0GA10, 3RV2021-1FA15), but the 3RV1021-0JA15 is the 1 A Class 10 variant with 100 kA breaking capacity.
Environmental and Compliance
Operating temperature range: –20 to +60 °C; storage and transport: –50 to +80 °C. Shock resistance: 25g / 11 ms. The part carries a substance prohibitance date of 01.05.2012, indicating RoHS/REACH compliance as of that date.