SMAP are hydro-electric pressure swit-ches with fixed switching pressure diffe-rential. The mechanical microswitch with gold plated contacts grants high reliability and long life service. The microswitch changes its status when the pressure in the hydraulic circuit rea-ches the switching value set on the adju-sting knob.The microswitch returns to the original rest position when the pressure in the hydraulic circuit drops below the nominal fixed switching pressure differen-tial (hysteresis). The electric connector provides both NC or NO contacts. The pressure in the circuit operates the piston acting against the adjustable spring ; once the pressure setting is reached, the pistonactuates the microswitch . The pressure switching value is selectable by a graduated adjusting knob . Clockwise rotation increases the setting pressure. Max pressure: 650 bar