Siemens 3RV2021-1AA10 Motor Protection Switch

Siemens 3RV2021-1AA10 is a 3-pole motor protection switch (SIRIUS 3RV2) designed for DIN-rail mounting on the S0 frame to guard small motors from overload and short-circuit at up to 690 V AC. It provides adjustable thermal overload protection in the 1.1–1.6 A range and, for motors in the 220–690 VAC band, corresponds to roughly 0.55 kW of rated power. The unit includes phase-loss protection and a rotary ON/OFF handle for hands-on control, and it delivers up to 100 kA short-circuit breaking capacity with screw-terminal connections. This makes it a compact, reliable choice for motor protection in control panels where space is at a premium and robust protection is required.