Motor-protection circuit breaker, 1 A, CLASS 10, 100 kA
The Siemens 3RV1021-0JA10-ZW97 is a SIRIUS motor-protection circuit breaker rated for 1 A continuous current with a CLASS 10 trip characteristic. Breaking capacity is 100 kA at 400 V AC, which covers most industrial distribution panels up to that fault level without needing upstream current-limiting fuses. Rated insulation voltage is 690 V.
Mounting and integration
Snap-on mounting onto 35 mm DIN rail per EN 50022; footprint is 45 mm wide × 97 mm high × 96 mm deep, fitting standard panel layouts with no side clearance required. Main circuit connections are screw-type terminals accepting 2× (1…2.5 mm²) solid or stranded, or 2× (2.5…6 mm²) — covers most motor feeder cable sizes up to 6 mm². IP20 protection on the front; suitable for enclosed panel use where no washdown or dust ingress is expected.
Key ratings in context
Phase failure detection is built in, so the breaker will trip if one phase drops out — critical for preventing single-phasing damage on three-phase motors. Rated for 100 000 mechanical cycles typical, which is standard for this class of motor-protection breaker in frequent-start applications. Power dissipation is 7.25 W total in hot operating state (2.4 W per pole), so panel thermal rise is modest — no forced cooling needed in most enclosures. Operating temperature range -20 to +60 °C covers most indoor industrial environments; storage and transport range -50 to +80 °C.