Non adjustable differential type. Spring loaded sealed piston construction. Encapsulated design for protection against dust. Six pressure ranges available, which can be adjustable upto 10, 50, 100, 200, 350 and 420 bar. A pressure switch is a form of switch that closes an electrical contact when a certain set fluid pressure has been reached on its input. The switch may be designed to make contact either on pressure rise or on pressure fall.