Siemens 3RV2021-1AA10 Manual Motor Protector 3-Pole

Siemens 3RV2021-1AA10 is a three-pole manual motor protector in the S0 size of the SIRIUS 3RV2 family, designed to protect small motors on 220–690 V AC circuits. It provides thermal-magnetic overload protection with an adjustable current setting from 1.1 to 1.6 A per pole, enabling protection for motors up to about 0.55 kW (0.74 hp) at the typical voltage range. This DIN rail‑mountable device integrates into motor control cabinets as a compact protection module and features a rotary ON/OFF handle for manual operation. Optional accessories, such as the 3RV2901 two-pole auxiliary contact kit, can provide signaling or interlocking functionality while keeping the protection function in a single unit. Part of Siemens' broader motor protection lineup, this 3RV2 device is designed for straightforward field configuration and reliable protection in applications like conveyors, fans, pumps, and machine tools where tight current setting control and quick disconnection are important.