The importance of contact grease for electronic switches

An electronic switch is an operating unit that uses electronic circuits and power electronic devices to achieve circuit on and off. It includes at least one controllable electronic drive device. The electronic switch includes various linear contacts, switch contacts with low pressure or small driving force; at low temperatures Automatic switches for operation; micro switches, potentiometers, variable resistors, tact switches, button switches, acousto-optic control switches, relays, electrical contact metal surfaces of coding components, thyristors, transistors, field effect tubes, etc. Electronic switches are generally in surface contact between metal sheets and metal sheets. Because the switch needs to slide or tap to move repeatedly, when the switch is sliding, the friction between the metal sheets will be more obvious. When the metal sheet is worn out, it is easy Causes problems such as poor contact of the switch. This type of problem is especially obvious for switches with long working hours and high service life; basically, there will be a plating layer on the switch metal sheet to protect the metal sheet from oxidation, but under long-term friction conditions, The metal plating layer is easily worn away, and the metal sheet that loses the protection of the plating layer is easily oxidized when exposed to the air, and the metal oxide formed by oxidation will generate a certain additional resistance, thereby reducing the conductivity of the switch. At the same time, due to the continuous oxidation and wear of the metal sheet, the service life of the switch is greatly shortened; when the current passes through the switch, it is easy to generate an instantaneous high voltage between the metal contact sheets, forming an arc, and generating an electric spark. The plastic parts around the metal sheet are melted or burnt. Therefore, it is particularly important to choose a suitable switch contact grease.