Siemens 3RV1021-1JA10 Motor Protection Circuit Breaker

Siemens 3RV1021-1JA10 is a three‑pole Sirius motor protection circuit breaker (size S0) with Class 10 thermal trip and A‑rel release, designed for motor protection and DIN‑rail installation. It provides overload protection with an adjustable trip range from 7 to 10 A and a continuous current rating of 10 A, suitable for protecting motors around 3 kW at up to 690 VAC. It includes a 130 A short‑circuit release for fast disconnection on fault currents, uses screw terminals for secure wiring, and offers an optional auxiliary switch for signaling. The unit is front‑mounted IP20 protected, rated for roughly 100,000 mechanical switching cycles, and has a typical power loss around 7 W with surge voltage resistance up to 6 kV. It is intended for control panels and can be installed in environments up to 2,000 meters above sea level,making it a compact, reliable motor‑protection solution for demanding 690 VAC systems.