125 psi, air-compressor pressure switch, controls an electrically driven air compressor in a power circuit when the adjustable threshold upon falling is reached & is set to turn off at 125 psi, switch has a 1/4" npt external fluid connection & is suitable for use with a higher-horsepower motor with 2 hp or greater, non-adjustable differential is 40 psi & the adjustable cut-out range is 100-200 psi, switch is diaphragm actuated & has a fixed differential, threshold, or setting point, upon rising adjusts with a screw nut, has screw terminal electrical connections & two 2 pole nc contacts open on rising pressure, includes a 2 way pressure release valve, maintained manual cut out lever has auto & off positions.