Siemens 3RV1021-0JA10 Molded Case Circuit Breaker

Siemens 3RV1021-0JA10 is a 3-pole Sirius molded‑case circuit breaker sized S0, built for motor protection in industrial control panels and switch cabinets, combining thermal and magnetic trip elements to guard motors against overloads and short circuits. Rated for up to 690 V AC and compatible with DIN-rail mounting, it uses screw terminals for secure wiring and offers a Class 10 thermal‑magnetic trip characteristic, with a selectable overload release in the 0.7–1 A range to match motor starting current and ensure selective protection. The unit features IP20 front protection and is rated for installation at elevations up to 2000 meters above sea level, with an impulse withstand rating of 6 kV, making it suitable for rugged indoor environments where reliable motor control is essential. Siemens lists 3RV1021-0JA10 as discontinued and recommends the 3RV2011-0JA10 as its direct successor, so buyers seeking current availability should reference the replacement while acknowledging the original model's motor‑protection heritage within the Sirius/MCCB family.