Easy-to-wire, smooth operation and reliable. Able to withstand some washdowns, shock and vibration. Roller Plunger is easier than none roller plunger switch for Air Curtains Door Access. The limit switch can be widely used in automatic control of various machinery, limit movement, transmission mechanism action or program control switch. The silver contact limit switch can increase the frequency of use of the conductor, increase the contact effect, and enhance the performance of the conductor. It also has the advantages of wear resistance, heat resistance and oxidation resistance.