The Siemens SENTRON 3VA9477-0GF10 is a 12-inch (300 mm) shaft designed for door-mounted rotary operators, used to mechanically link the breaker handle to the enclosure door on 3VA molded-case circuit breakers. It fits the 3VA51/52/53/54 frames (125 A through 600 A) and the 3VA61/62/63/64 frames (150 A through 600 A).
This shaft is the mechanical link between the breaker's rotary handle and the door-mounted operator. The 300 mm length suits enclosures where the breaker is set back from the door; it lets the operator extend through the door so the handle can be turned without opening the panel. The 3VA9477-0GF10 is a standard accessory for 3VA51–3VA54 breakers (125 A to 600 A) and 3VA61–3VA64 breakers (150 A to 600 A) — no special adapter needed for those frame sizes.