Siemens 3RV1021-1HA10 Three-Phase Soft Starter

Siemens 3RV1021-1HA10 is a SIRIUS three‑pole motor protection circuit breaker (starter protector) in the compact Size S0, designed to guard small three‑phase motors against overloads and short circuits while simplifying starter wiring. Mounted on a standard DIN rail, it uses screw terminals and ships without an auxiliary switch, making it a straightforward fit for basic motor protection stations. The device supports 220–690 VAC three‑phase systems and provides an overload setting adjustable within roughly 5.5–8 A (FLA), with a short‑circuit current rating up to 100 kA at 400 VAC. As part of the Siemens Sirius 3RV1 family, it serves in applications such as conveyors, pumps, fans, and other small industrial machines where reliable current protection and easy integration with control logic are essential. This unit is intended for use in protection configurations that require compact enclosure space, DIN rail mounting, and screw‑terminal wiring, offering a clear, code‑compliant solution for motor protection in standard industrial control panels.