Pressure Switch, Air Compressor, Standard Action, Factory On/Off Set 140 to 175 PSI, Pressure Range 60 to 232 PSI, Adjustable Differential, Differential Pressure 30 to 110 PSI, Burst Pressure 580 PSI, Port Type 1-Port 3/8 In NPT (Female), 1/4 In Compression Unloader, Diaphragm Actuation Type, Single/Three Phase, 3PST Contact Type, 30 Amps, NEMA 1 Enclosure, Temp Range -22 to 257 F, Standards UL/CSA/CE Air Compressor Pressure SwitchesFor all global air compressor and water applications. Rotatable unloader valve simplifies retrofit onto compressors. Diaphragm actuated. For 1/4 to 3/8" brass adapters, see pages 4256, 4257, 4258.MDR3 and MDR3/0L SeriesMDR-3/OL Series combines the function of a pressure switch and magnetic starter into 1 unit. Built-in overload protection.All are UL Listed, CSA and CE Certified.3PST Switch Rated 30A Temp. range: -22 to 257 F