The Siemens 3VM9211-0WF40 is a terminal cover extended 4-pole accessory, designed for use with 3VM12 molded case circuit breakers. It ships as a single piece and covers the extended terminal area on the line or load side of the breaker, maintaining finger-safe clearance and IP2X touch protection at the connection points.
The cover mounts directly onto the 3VM12 breaker's extended terminal studs. It is a 4-pole variant, meaning it covers all four poles on a 3VM12 four-pole breaker or the four outgoing terminals on a three-pole unit with a neutral. The packaging dimensions (145 x 101 x 75 mm) give a sense of the clearance needed inside the enclosure.