The Siemens 3VA9988-0BL30 is a SENTRON shunt trip — an auxiliary release that sits in the left accessory slot of 3VA1 and 3VA20 through 3VA25 molded-case circuit breakers. It trips the breaker on command from a remote signal, typically a panic button, relay, or safety PLC output. Coil rating is 24 V AC 50/60 Hz or 24–30 V DC, pulling up to 30 VA apparent or 45 W DC at the moment of trip.
The 30 VA / 45 W coil draw is a momentary pulse, not a holding load; the control transformer or PLC output must deliver that peak without voltage sag. Dimensions are compact: 65.1 mm tall, 25.7 mm wide, 31.2 mm deep — it fits entirely inside the breaker's accessory cavity, no external bracket.