When selecting the push button switch, pay attention to the size and type of the electric load. Because of the different types of push switches, the electrical load bearing capacity varies greatly. In the mechanical equipment, a relatively large type of key switch, such as an AN type, is generally used, which can be used in an automatic electromagnetic switch of an AC motor, and an automatic program changeover of a manual start, an emergency brake, a hydraulic press, and the like.

In order to cope with the localization process of weapon equipment, the button switch has developed a similar button switch with lights. This type of switch is small in size and reliable in contact, and has been widely used in military and civilian radio equipment and automatic control equipment in production.

The push button switch is a switch that drives the internal contact switch by the same straight line driving force as the button stroke, but the linear drive switch is not all the button switch, such as a micro switch, but the button switch is usually used as a micro switch to make its switch. section. The pushbutton switches at home and abroad tend to be linearly driven, so the pushbutton switches are developing rapidly. There are many types of button switches, and the complexity is different. The simple ones are single-pole and single-throw. The complex ones include illumination and logo display. There are several units and various locking states for easy operation in dark places or nights, as well as switches and indications. The lamp has dual functions and is available in a variety of color indications. The illuminated button switch is easy to fail due to the bulb, the failure of the bulb is not equal to the failure of the switch, and the illumination bulb can be replaced from the front of the panel. Multi-unit button switches are often installed in rows, and each unit can operate independently. The key switch is characterized in that it is installed in the machine and instrument in progress, and most of the time is in the initial free state position, but only when required, it is switched to the second state (position) under the action of external force, when the external force Once removed, the switch returns to its original position due to the action of the spring.