Siemens 3RV1021-1KA10 Motor Protection Circuit Breaker

Siemens 3RV1021-1KA10 Sirius Innovation motor protection circuit breaker (MPCB), size S0, delivers integrated overload and short‑circuit protection for small motors in a compact DIN‑rail mounted package. It is rated for a motor current between 9 and 12.5 A and supports voltages from 220 to 690 VAC at 50/60 Hz, making it suitable for a wide range of industrial motors, from fans and pumps to conveyors. This A‑release MPCB uses thermal overload and magnetic tripping to protect the motor, and it is supplied without an auxiliary switch; terminals are screw type for reliable wiring. With an Icu rating up to 100 kA at 400 V, it provides robust short‑circuit protection, while its Class 10 thermal protection ensures accurate overload protection in typical start/run cycles. The 3RV1021‑1KA10 is part of Siemens Sirius Innovation motor protection family and serves as a compact, code‑compliant protective device that combines the functions of a disconnecting switch and motor protector in one unit.