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What are the principles and components of the micro switch?

Issuing time:2017-12-30 00:00

The mechanical force outside the micro switch acts on the action reed through the transmission elements (pins, buttons, levers, rollers, etc.). When the action reed displaces to the critical point, it produces instantaneous action, which makes the moving contact at the end of the action reed connect or disconnect quickly with the fixed contact.


When the action force on the transmission element is removed, the action spring produces the reverse action force. When the reverse stroke of the transmission element reaches the critical point of the action of the spring, the reverse action is completed instantaneously. The micro switch has the advantages of small contact spacing, short travel, small press power and quick on-off. The speed of the moving contact has nothing to do with the speed of the transmission element.

Micro-switch is a kind of pressure-actuated fast switching switch, which is named micro-switch, also known as sensitive switch, because the contact spacing of the switch is relatively small. Electrical Character Symbol: SM.

Working principle

When the external mechanical force acts on the spring through the transmission element (according to the pin, a button, a lever and a roller), when the spring moves to the critical point and produces instantaneous action, it moves at the end of the moving contact and the fixed contact is switched on or off quickly. When the force transfer element is disassembled, the spring motion produces a reverse force. When the transmission element is reversed, it is twisted to the critical working point of the spring and acts completely in reverse instantaneously. The micro switch has small contact spacing, short movement, low power and fast break. The speed of the moving contact is independent of the speed of the driving element.

Microswitch structure

The micro switch has a small contact interval and a fast action mechanism. The contact force with the prescribed stroke and switch is the driver covering the shell and the outside, and a small form factor.

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