The microswitch is a type of switch that has a small contact spacing and a quick-acting mechanism. It is a contact mechanism that operates with a specified stroke and a specified force, covered by a housing, and has a driving rod on the outside. Since the contact spacing of its switch is relatively small, it is named a microswitch, also known as a sensitive switch.
It is also called a sensitive switch and a quick-action switch. It is a quick switch actuated by applying pressure. It is used in door switches of anti-theft systems, etc.
Term Introduction
As the name implies, a microswitch is a switch that can be operated with a very small amount of force. It is a switch in which an external mechanical force acts on the operating reed through a transmission element, causing the fixed contact at its end to quickly connect or disconnect with the moving contact.
The microswitch has a small contact spacing and a quick-action mechanism. It is a contact mechanism that operates with a specified stroke and force, covered by a housing, has a transmission device on the outside, and has a small shape.
The microswitch is composed of five major categories of constituent elements. Its contact spacing is small, and the torque is large. Generally, there is a driving rod on the outside.
Working Principle
The external mechanical force acts on the operating reed through the transmission element (such as a pushpin, button, lever, roller, etc.). When the operating reed is displaced to the critical point, an instantaneous action occurs, causing the moving contact at the end of the operating reed to quickly connect or disconnect with the fixed contact.
When the acting force on the transmission element is removed, the operating reed generates a reverse acting force. When the reverse stroke of the transmission element reaches the operating critical point of the reed, the reverse action is completed instantaneously.
The microswitch has a small contact spacing, a short operating stroke, a small pressing force, and rapid on-off. The operating speed of its moving contact is independent of the operating speed of the transmission element.
Switch Classification
There are a wide variety of microswitches, and there are hundreds of internal structures. According to the volume, they can be divided into ordinary type, small type, and ultra-small type; according to the protection performance, they can be divided into waterproof type, dustproof type, and explosion-proof type; according to the breaking form, they can be divided into single-contact type, double-contact type, and multi-contact type.
There is also a strong break microswitch (when the reed of the switch does not work, an external force can also make the switch break); according to the breaking capacity, it can be divided into ordinary type, DC type, micro-current type, and large-current type.
According to the usage environment, it can be divided into ordinary type, high-temperature resistant type (250℃), and ultra-high-temperature ceramic type (400℃).
The microswitch generally takes the form without an auxiliary pressing accessory as the basic type, and derives small-stroke type and large-stroke type. Different auxiliary pressing accessories can be added according to needs. According to the different added pressing accessories, the switch can be divided into various forms such as button type, reed roller type, lever roller type, short arm type, long arm type, etc.
In terms of size, there are small type, ultra-small type, super small type, etc. In terms of function, there is the waterproof type. The most common application is the mouse button.
(1) Small Microswitch:
The general size is 27.8 in length, 10.3 in width, and 15.9 in height. In terms of parameters, there are different changes such as high capacity and low load.
(2) Ultra-small Microswitch
The general size is 19.8 in length, 6.4 in width, and 10.2 in height. In terms of function, it has different performances such as high precision and long life.
(3) Super Small Microswitch
The general size is 12.8 in length, 5.8 in width, and 6.5 in height. In this type, there is also a super-thin design.
(4) Waterproof Type
