The Elta 149-AS Air Proving Switch operates on 220 – 250VAC at 50Hz with a 16A (6) contact rating. It features adjustable cut-in and cut-out airflow settings, ranging from a minimum cut-in of 2.5m/s and cut-out of 1m/s to a maximum cut-in of 9.2m/s and cut-out of 8m/s. The unit is designed for durability with an IP65 protection rating, making it suitable for various industrial and commercial applications.