This device functions as a motor starter protector with a rotary ON/OFF handle. It provides comprehensive protection for electric motors against overloads and short circuits. According to the manufacturer’s website, this product is phased out and is no longer available.
Motor Overload SWT – (3RV1031-4FA10/10161683) SIEMENS
The Siemens 3RV1031-4FA10 is a circuit breaker designed for motor protection, capable of handling currents from 28 to 40 amps. It is part of the SIRIUS 3RV10 series and features thermal-magnetic trip protection.