What this 3.2 A motor protection breaker is and what it does
The Siemens SIRIUS 3RV1021-1DA15-ZW98 is a motor protection circuit breaker rated for 3.2 A continuous current and a 1.1 kW motor at 400 V AC, with a Class 10 trip characteristic — meaning it clears overloads fast enough to protect standard induction motors during start-up without nuisance tripping. It mounts via screw or snap-on onto 35 mm DIN rail per EN 50022, occupies 45 mm width, and is IP20 on the front — standard for enclosed panel installation. Phase failure detection is built in, so a lost phase on the line side will trip the breaker before the motor single-phases to failure.
Breaking capacity and coordination
Rated short-circuit breaking capacity is 100 kA at 240 V, 400 V, and 500 V AC, dropping to 8 kA at 690 V AC — that 100 kA figure means it can be used in high-fault panels without needing an upstream current-limiting fuse for most industrial installations up to 500 V. The auxiliary switch (transverse design) is included on this variant, so you get a status contact for PLC feedback or a holding circuit without adding a separate block. Screw-type terminals on the main circuit accept solid conductors 2x (0.5…1.5 mm²) and 2x (0.75…2.5 mm²), and stranded 2x (1…2.5 mm²) and 2x (2.5…6 mm²) — covers standard motor cable sizes up to 6 mm².