The push button switch is a main electric appliance with a simple structure and a wide application. In the electrical automatic control circuit, it is used to manually send out control signals to control contactors, relays, electromagnetic starters, and the like. The push button switch can perform basic control such as start, stop, forward and reverse, shifting, and interlocking. Usually each push button switch has two pairs of contacts. Each pair of contacts consists of a normally open contact and a normally closed contact. When the button is pressed, the two pairs of contacts act simultaneously, the normally closed contact opens, and the normally open contact closes. The color of the button switch is red, green, black, yellow, blue, white, etc. For example, red indicates a stop button, green indicates a start button, and the like. The main parameters, type, mounting hole size, number of contacts and current capacity of the contact switch are selected in the selection button switch manual. Commonly used domestic products are LAY3, LAY6, LA20, LA25, LA38, LA101, LA115 and other series. Hex Head Bolt,Hex Screws,Hex Flange Head,Flange Head Nuts Shaoxing Grace International Trade Co.,Ltd , https://www.shaoxinggrace.com