The Pumptrol FSG2J21BP electromechanical pressure switch by Square D is the most trusted brand in residential, commercial and industrial pumping applications. The FSG2J21BP has a 30 psi to 50 psi pressure setting range activates an electrically driven water pump within a power circuit when the adjustable rising and falling thresholds are reached. The NEMA 1 enclosure has a 1/4 in. NPSF internal fluid connection and screw clamp terminals. The switch works with a 1.5 HP or less pump. The adjustable differential range is 15 psi to 30 psi and the cut-out range is 20 psi to 65 psi. The enclosure is National Electrical Manufacturers Association (NEMA) Type 1 and Ingress Protection (IP) 20 rated. The switch is Underwriters Laboratory (UL) Listed and Canadian Standards Association (CSA) Certified. For over 75 years, Square D pressure switches continue to meet the needs of our customers. Square D Pumptrol pressure switches are manufactured by Schneider Electric.The Square D by Schneider Electric Pressure Switch is compatible with jet pumps, submersible pumps and reciprocating pumps. The standard action contacts open on rising pressure.