SIRIUS 3RV1021-1EA10-ZW97 — Motor Protection Circuit Breaker, 4 A, CLASS 10
The Siemens SIRIUS 3RV1021-1EA10-ZW97 is a 3-pole motor protection circuit breaker rated for 4 A continuous current with a CLASS 10 trip characteristic, making it a direct fit for protecting standard 1.5 kW motors at 400 V AC. It snaps onto a 35 mm DIN rail per DIN EN 50022 and can be mounted in any position — no derating for vertical or horizontal orientation, which simplifies panel layout. Breaking capacity is 100 kA at 400 V AC and holds that rating up to 500 V AC, dropping to 6 kA at 690 V AC — so in most 400 V industrial panels this breaker clears faults without cascading upstream.
Trip Class and Motor Protection
CLASS 10 means the bimetal trip opens within 10 seconds at 7.2× the rated current — fast enough to protect a standard squirrel-cage motor during a locked-rotor event without nuisance tripping on normal starts. 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. Ground fault detection is not included — that requires an external module or upstream RCD. Rated operational voltage for AC-3 duty is 690 V maximum, and the unit dissipates 7.25 W total (2.4 W per pole) in hot operating state — factor that into enclosure thermal calculations if panel is tightly packed.
Termination and Integration
Screw-type terminals on both main and auxiliary circuits accept 2x (1... 2.5 mm²) solid or stranded, or 2x (2.5... 6 mm²) — covers most panel wiring up to 6 mm² without lugging. The auxiliary switch slot is populated, so you get a signal contact for PLC feedback or status indication without an add-on block. IP20 on the front — suitable for enclosed panels; no washdown rating, so keep it behind a gland plate or cabinet door.
Environmental and Compliance
Operating temperature range is -20 to +60 °C; storage and transport extend to -50 to +80 °C. Shock resistance rated at 25g for 11 ms. Substance prohibitance date of 01.05.2012 aligns with RoHS compliance — the part meets EU substance restrictions effective from that date.