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Knowledge Base Blog

What is a micro switch?

What is a micro switch?

17 Aug 2020

A micro switch is a contact mechanism that has a small contact interval and a snap-action mechanism, and uses a specified stroke and a specified force to switch action. It is covered by a shell and has a drive rod outside of it. Because the contact distance of the switch is relatively small, hence the name micro switch, also known as sensitive switch or snap-action switch.


The micro switch, just like its name, that used a very small force to switch. It is a switch in which external mechanical force acts on the moving reed through a transmission element to quickly connect or disconnect the fixed contact and the moving contact at the end.

The micro switch has a small contact interval and a snap-action mechanism. The contact mechanism that uses a specified stroke and force to switch action is covered by a housing, and there is an actuator outside of it, and its appearance is small.

The micro switch is composed of 5 major types of constituent elements. The contact distance is small and the torque is large. Generally there is a drive rod outside

Principle of work

The external mechanical force acts on the action reed through the transmission elements (press pins, buttons, levers, rollers, etc.). When the action reed is displaced to the critical point, an instantaneous action is generated, so that the moving contact at the end of the action reed and the fixed contact click to quickly turn on or off.

When the force on the transmission element is removed, the action reed generates a reverse action force. When the reverse stroke of the transmission element reaches the critical point of the action of the reed, the reverse action is instantaneously completed.

The contact distance of the micro switch is small, the action stroke is short, the pressing force is small, and the on-off is rapid. The speed of the moving contact has nothing to do with the speed of the transmission element.

UVC Sterilizer Box_2.0 Pro

UVC Sterilizer Box

The funtion of UV disinfection box is to eliminate for cell phones, keys, glasses, kids toys, jewelry, cash, wallet, cosmetic tools, accessories. The purpose of disinfection is achieved through UVC. But UVC is harmful to the human body, especially the skin and eyes. In case of hurting skin, We use the micro switch in this product. When person opens the cover, the micro switch will be disconnected, the power supply will be cut off automatically, and the ultraviolet rays will be turned off, ensuring safety.

In the common mouse in our daily life, the left and right buttons also use micro switches.

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