The micro switch is a contact mechanism with a small contact interval and a snap action mechanism, and the switch action is performed with a specified stroke and a specified force. It is covered with a shell and has a drive rod outside. A kind of switch, because the contact distance of the switch is relatively small, it is called a micro switch, also called a sensitive switch. The micro switch has a small contact interval and a quick-action mechanism. The contact mechanism that performs the switching action with a specified stroke and force is covered by a casing, with a driver outside and a small shape. Micro switches are composed of five major categories of components. The contact distance is small and the torque is large. Usually there is a drive rod on the outside.
External mechanical force acts on the action reed through transmission elements (press pins, buttons, levers, rollers, etc.). Instantaneous action occurs when the action reed is displaced to a critical point. The moving contact and the fixed contact at the end of the action reed are quickly connected or disconnected. When the force on the transmission element is removed. The action reed produces the opposite action force. When the reverse stroke of the transmission element reaches the critical point of action of the reed. The reverse action is completed instantaneously. The contact distance of the micro switch is short, and the action stroke is short, and the on-off is fast according to the power. The action speed of the moving contact has nothing to do with the action speed of the transmission element.
Features of microswitches
1. Although small in size, it can switch large currents
Normally, when an electronic circuit is closed, sparks called arcs are generated between the contacts. The larger the current is, the easier it is to generate arc light, the slower the speed of switching the contacts, and the longer the duration of the arc light, which is the factor leading to the deterioration of the contacts. The snap action mechanism of the micro switch can switch the contacts instantaneously, so the arc duration is short, and the size is small, but it can be used in circuits with large currents.
2. High precision
The microswitch can basically switch the contacts at the same position even if it is repeatedly opened/closed, so the position detection error is small, and it is suitable for applications requiring high precision. This is also a unique advantage of microswitches with snap-action mechanisms.
3. Durability
Due to the short duration of the arc, the damage to the contacts is relatively small, so the durability has been improved.
4. Touch and sound
The snap-action mechanism has a unique touch and sound when operating, so the operation can be confirmed by touch and hearing.
Features of Micro Switches
1. Ultra-small, lightweight and high-precision.
2. The m2mm type of general-purpose small screws can be used.
3. The structure of forming the terminal and the base distance at the same time makes it difficult for solder and flux to penetrate into the inside of the switch.
4. A low-power circuit type (au cladding contact) that is most suitable for small voltage and current loads is also available.
5. Self-supporting terminal, easy to install on the printed board. The switch body is independent with respect to the printed board of 1.2~1.6mm.
6. There are also a series of right-angled terminals and left-angled terminals on the printed board.
7. Comply with rohs instruction.
The micro switch is used for automatic control and safety protection in equipment that requires frequent circuit switching. Widely used in electronic equipment, instrumentation, mining, power systems, household appliances, electrical equipment. As well as aerospace, aviation, ships, missiles, tanks and other military fields. The switch is small. But it plays an irreplaceable role.
