Siemens 3RV2021-4CA10 Manual Motor Protector

Siemens 3RV2021-4CA10 is a three-pole manual motor protector (MMP) in size S0 from the SIRIUS 3RV family, designed to guard three‑phase motors against overload and short circuits in control panels and machine circuits. It combines thermal overload protection with magnetic short‑circuit protection and uses screw terminals for straightforward wiring; it is rated for an A‑release current of 16–22 A and a short‑circuit release of 286 A (N‑release), with standard switching capacity. The device is intended for up to 690 VAC operation and is commonly associated with motors around 11 kW at 400 VAC, offering a compact, DIN‑rail mounted protection solution for motor circuits. This compact, 3‑pole protector provides reliable motor protection in a single unit designed for panel installation.