Siemens 3RV2021-1BA10 Manual Motor Protector 3 Pole

Siemens 3RV2021-1BA10 is a size S0, three-pole manual motor protector designed to guard three‑phase motors in electrical control cabinets. It supports motor protection for voltages up to 690 V AC and is designed for DIN‑rail mounting with screw-terminal connections for wiring. The overload protection is adjustable in the 1.4 to 2 A range (Class 10 A release), and the device also lists a short‑circuit release at 26 A. This combination provides protection against both overloads and fault currents in motor circuits. The unit targets automation and machinery applications where a compact, dedicated motor protection device is required, and it belongs to the Siemens Sirius family of motor protection devices. Typical applications include motor protection in conveyors, pumps, fans, and other loads within panel‑mounted automation systems, where a defined current setting supports safe start‑up and reliable operation.