Shunt trip left — 12 V DC for 3VA moulded-case breakers
The Siemens 3VA9988-0BL10 is a shunt trip (auxiliary release) designed for left-side mounting in 3VA1 and 3VA20 through 3VA25 moulded-case circuit breakers. It operates on a 12 V DC control supply and draws a maximum of 30 W during the trip event. The part carries a surge voltage resistance of 4 kV, overvoltage category III, and degree of pollution 3 — ratings that confirm it is built for industrial panel environments with moderate to heavy contamination and transient exposure.
This shunt trip occupies the left accessory slot in the breaker frame — it is not a standalone component. The body measures 65.1 mm high, 25.7 mm wide, and 31.2 mm deep. Wire stripping length is 10 mm (0.4 in). It is not a DIN-rail device; it clips into the breaker's accessory bay. The three internal slots correspond to the left-side position only.