The Siemens 3VA9908-0BD11 is a universal auxiliary release — a shunt trip accessory — designed for the SENTRON 3VA1 and 3VA20 through 3VA25 molded case circuit breaker families. It operates on a 12 V DC control supply and draws up to 20 W at peak.
The release occupies three accessory slots in the breaker. Physical dimensions are 25.7 mm wide, 65.1 mm high, and 28.8 mm deep — it nests inside the breaker's accessory compartment, not on the DIN rail. Terminals accept conductors stripped to 10 mm (0.4 in). No additional panel space is consumed beyond the breaker's own footprint.