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Application: Used to Regulate the Tank Pressure Between Two Preset Values on Small Electrically Driven Air Compressors Up to 230 PSI, UL Listed CSA Certified RoHS Compliant, NEMA 1 Enclosure, Optional 3R Enclosure Available, Rated for Both 50/60Hz Operation, 2 Way Pressure Relief Valve (Unloader) Releases Head Pressure On the Compressor Upon Cut Off at the Switch, Adjustable Cut Out Pressure, Fixed Differential, Contacts Open On Pressure Rise, Electrical Connection: 2 - 1/2 NPT Conduit Entries, Diaphragm Actuated, 2 Pole Snap Action Contacts, Feature Drift Proof Cut In and Cut Out Settings, Easy Inspection With Vertical Contacts, Extra Strong Frame that Resists Distortion When Mounting the Switch to a Compressor, Temperature Range : -22°F to 257°F