Siemens 3RV1021-1FA15 Motor Starter

Siemens 3RV1021-1FA15 is a compact S0‑size motor starter protector from the Sirius 3RV1 family that combines overload protection with built‑in switch functionality for small three‑phase motors. Rated for 50/60 Hz operation up to 575 VAC, it provides Class 10 thermal overload protection with an adjustable main current setting from 3.5 to 5 A, enabling precise matching to motor FLA. The unit includes a transverse, front‑mounted auxiliary contact: 1 normally open and 1 normally closed (preinstalled 3RV1901‑1E), which supports simple signaling or interlocking in control circuits. Designed for DIN‑rail mounting, it offers a compact, integrated motor protection solution suitable for panel installations and as a space‑saving alternative to separate overload relays in low‑to‑moderate current motor circuits.