... The product is pressure switch used for the high and low pressure protection of some refrigeration systems. The product pressure switch ... is used for the high and low pressure protection of some refrigeration systems such as residential, commercial ... range: extra-high (800 ~ 2,200PSI), high (145 ~ 700PSI), low (3 ~ 145PSI), vacuum (-7.4 ~ 0PSI)3. Electrical control method ...