The ASCO Series P pressure switches consist of an open-frame or enclosure-protected switch and a transducer unit. They can be ordered separately for customer stocking and/or field assembly or as a complete factory-assembled unit. ASCO P Series switches incorporate the unique ASCO TRI-POINT alternating fulcrum balance plate to control the operation of one or more electrical snap-action switches. The pressure switch and transducer unit are fully-tested, self-contained subassemblies.