Siemens 3RV1021-1HA10 Contactor Motor Starter

Siemens Sirius 3RV1021-1HA10 is a three-pole motor protection circuit breaker (motor starter) in the S0 size, designed for DIN-rail mounting to protect three-phase motors up to 3 kW at 400 V in AC-3 service. It combines an adjustable A‑release overload (5.5–8 A) with a fixed short‑circuit release (N‑rel) of 104 A and a continuous current rating of 8 A, delivering protection for motor start-up and operation while supporting a 100 kA short-circuit breaking capacity at 400 V. Rated for 220–690 VAC and AC/DC type voltage, the device uses screw terminals, has no auxiliary contacts, and adheres to Class 10 trip characteristics for predictable response. Siemens catalogs this model as phased-out, with the recommended successor 3RV2011-1HA10, making it a consideration mainly for legacy installations and upgrade planning.