Siemens 3RV2021-1AA10 Soft Starter Controller

Siemens 3RV2021-1AA10 is a three-pole Sirius 3RV2 manual motor protector (starter) designed for protective switching and basic motor control in control panels. It provides adjustable overload protection from 1.1 to 1.6 A with Class 10 thermal characteristics, a rotary ON/OFF handle for local control, and integrated phase-loss protection. Rated for 220–690 VAC and suitable for small three-phase motors, it delivers about 0.55 kW of motor protection capacity. The unit is DIN-rail mountable, front IP20 protected, and uses removable terminals for the main and auxiliary/control circuits, simplifying wiring and service. Additional specs include a 21 A short-circuit trip rating and impulse voltage resistance up to 6 kV, with three poles and standard wiring options for both main and control circuits. As part of the Siemens Sirius 3RV2 family, it is sized S0 and is intended for compact motor protection schemes that require reliable overload sensing, quick disconnect, and straightforward manual operation without a separate contactor.