What is a micro switch
A micro switch is a contact mechanism that has a small contact interval and a snap-action mechanism. It uses a specified stroke and a specified force to switch the contact mechanism. It is covered by a shell and has a drive rod outside of it. Because of the comparison of the contact distance of the switch Small, hence the name micro switch, also called sensitive switch.
Classification of micro switches
There are many types of micro switches. There are hundreds of types of internal structures. According to the volume, they are divided into ordinary, small and ultra-small; according to the protection performance, there are waterproof, dustproof, and explosion-proof types; according to the breaking type, there are Single type, double type, multi-connected type.
There is also a strong disconnection micro switch (when the reed of the switch does not work, the external force can also make the switch disconnect); according to the breaking capacity, there are ordinary type, direct current type, micro current type, and large current type.
According to the use environment, there are ordinary type, high temperature resistant type (250℃), super high temperature resistant ceramic type (400℃)
The basic type of the micro switch is generally without auxiliary pressing attachment, and the small stroke type and the large stroke type are derived. Different auxiliary pressing accessories can be added according to the needs. According to the different pressing accessories added, the switch can be divided into various forms such as button type, reed roller type, lever roller type, short boom type, and long boom type.
In terms of size, there are small, super small, super small and so on. Functionally, there is a waterproof type. The most common application is the mouse button.
(1) Small micro switch:
The general size is 27.8 long, 10.3 wide and 15.9 high. In terms of parameters, it has high capacity and low load.
(2) Subminiature micro switch
The general size is 19.8 long, 6.4 wide and 10.2 high. It has different functions such as high precision and long life.
(3) Super small micro switch
The general size is 12.8 in length, 5.8 in width and 6.5 in height. This model has an ultra-thin design.
(4) Waterproof type
The working principle of the micro switch
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, making 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 produces 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.
Post time: Dec-28-2020