Siemens 3RV1021-0KA10 Motor-Protective Circuit-Breaker

Siemens 3RV1021-0KA10 is a three-pole motor-protective circuit-breaker (size S0) designed to safeguard small industrial motors from overload and short circuits, with an adjustable thermal release from 0.9 to 1.25 A. It delivers Class 10 thermal protection and a magnetic release capability of 16 A for fast interruption of fault currents, and it uses screw-terminal wiring suitable for compact control-panel installations. The device carries front IP20 protection and includes a removable terminal for auxiliary and control circuits, supporting DIN-rail mounting in standard motor-protection applications. Siemens lists 3RV1021-0KA10 as no longer available and identifies the Sirius 3RV2 family successor 3RV2011-0KA10 as the recommended replacement.