The Elta 149S-A1729 is an overrun timer designed for ventilation systems, offering a flexible delay range from 4 seconds up to 5 hours. Compatible with rated loads of up to 5A and supporting a maximum current of 8A, this timer ensures continued operation after switch-off to fully clear air from spaces. It operates on a 220 – 240VAC 50Hz supply and is housed in a robust enclosure with IP56 protection, making it suitable for demanding environments.