The Siemens 3VA9988-0BA25 is a SENTRON shunt trip accessory designed for remote tripping of 3VA10 through 3VA14 and 3VA20 through 3VA24 molded-case circuit breakers. This is the flexible version, meaning it ships as a field-installable kit that mounts inside the breaker's accessory slots — three slots are available on the 3VA frame, so this release occupies one and leaves room for an alarm switch or undervoltage release.
That 4 kV surge voltage rating matches the impulse withstand expected on 400 V distribution panels under IEC 60947-1. The 300 VA apparent power draw is the coil's inrush when the trip signal is applied; the control transformer feeding it needs to handle that peak without dropping the voltage below the release's dropout threshold.
Physical fit in the panel
Dimensions are compact: 31.2 mm deep, 21.7 mm wide, 65.1 mm high. That width is less than a single modular unit (17.8 mm is one unit), so it fits inside the breaker's accessory cavity without consuming extra DIN-rail space. Strip length for the coil leads is 10 mm (0.4 inches) — standard for a spring-cage or screw terminal on the breaker accessory bus.