the product is applied for automatic liquid level control ( by liquid sensors or float switch) or pressure control (by pressure switch) and protection of single phase stainless steel/cast iron submersible pump for deep well , centrifugal pump, pipeline pump with output of pump motor: 0.37-4KW(0.5HP-5.5HP), direct startup type. Its special layout makes it possible to realize the sensitive and reliable function of stopping protection against pump dry-running without installing lower water tank (well) sensor, which makes it more convenient and economical to install deep-well submersible Input voltage: AC220V Single phase; Output power: 0.37-2.2KW/3-4KW Application: water supply and irrigation/sewage/drainage