The Siemens SENTRON 3VA9988-0BF22 is a fixed-delay time-delay accessory designed for use with the 3VA undervoltage release. It provides a 100 ms OFF-delay at 230 V AC, giving downstream controls a window to execute a controlled shutdown before the main breaker trips on undervoltage.
This module snaps onto the 3VA undervoltage release in the panel — no separate DIN-rail footprint needed. The 10 mm stripped length on the wiring tails matches standard ferrule and terminal-block prep for a clean dress inside the enclosure. At 72.3 mm deep, 44.8 mm wide, and 57.5 mm tall, it nests within the breaker's own profile, so it doesn't steal additional panel space.