Siemens 3RV1021-1GA10 is a Sirius motor‑protection molded‑case circuit breaker (MPCB) in size S0, designed for DIN‑rail mounting to protect small to mid‑sized motors. It delivers thermal‑magnetic overcurrent protection with a class 10 A‑release and a thermal current setting of 4.5–6.3 A, plus an instantaneous short‑circuit release rated at 82 A, suitable for motor circuits up to 2.2 kW at 220–690 V AC. The device uses screw terminals for connections and is explicitly marketed as a motor‑protection circuit breaker; Siemens also lists 3RV2011-1GA10 as the official successor, with the 3RV1021-1GA10 noted as no longer available.
