The Helios Fans ZNE is a miniature overrun timer switch designed for surface mounting behind a switch socket. It features fixed selectable overrun durations of 3, 6, 9, or 12 minutes, along with a delayed start time of 45 seconds. The device allows for extractor fan operation to be controlled via an on/off switch, commonly used in combination with lighting. Operating at 230 V~, it supports a maximum current of 1.25 A and a minimum of 0.05 A, providing efficient and reliable control for ventilation systems requiring timed operation.