Siemens 3RV2021-4AA15 is a Sirius 3RV2 motor protection circuit breaker (MPCB) in size S0 designed for three‑phase motors and 220–690 V AC operation. It provides thermal‑magnetic protection with an A‑release settable from 10 to 16 A and an N‑release of 208 A, and it includes a 1 NO + 1 NC auxiliary contact for signaling. The unit mounts on a standard DIN rail and uses screw‑terminal connections, with an IP20 enclosure suitable for panel mounting. This MPCB protects and disconnects motors in industrial control systems and serves as a compact, integrated protection device within Siemens motor protection offerings.
