The pump start relay is engineered to synchronize an irrigation pump with an irrigation/sprinkler controller. It is effective for a variety of water sources, including wells, ponds, and bore holes. 24 VAC leads connect the controller to the relay. It is capable of actuating 120 VAC pumps up to 1HP and 230 VAC pumps up to 2HP. The enclosure is constructed from durable water-resistant plastic. The pump start relay is compatible with irrigation controllers from Orbit, Hydro-Rain, and other major brands. For outdoor irrigation use with cold water only.