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.
There are many types of button switches, which can be divided into ordinary button type, mushroom head type, self-locking type, self-resetting type, rotary handle type, with indicator light type, illuminated symbol type and key type, etc. Buttons, three buttons and different combinations are generally made up of modular structures, consisting of button caps, return springs, bridge contacts and housings. They are usually made into a composite type with a pair of normally closed contacts and normally open contacts. Some products can increase the number of contact pairs by connecting multiple components in series. There is also a self-contained button that automatically holds the closed position when pressed and can only be turned on after a power failure.
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.
In order to indicate the function of each button and avoid misoperation, the button caps are usually made into different colors to distinguish them, and the colors are red, green, black, yellow, blue, white, and the like. 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 push button switch are described in detail in the product manual. Commonly used domestic products are LAY3, LAY6, LA20, LA25, LA38, LA101, LA115, LAY5, LAY7 and other series.
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