The micro switch is a contact mechanism with a small contact interval and a snap-action mechanism, and a contact mechanism that performs the switching action with a specified stroke and a specified force. Small, hence the name micro switch, also called sensitive switch. The electrical text symbol is: SM.
The purpose of the micro switch
Although the micro switch is small, it plays an irreplaceable role in our daily life, and realizes automatic control and safety protection in equipment that requires frequent circuit switching. At present, it has been widely used in electronic equipment, instrumentation, mining, power systems, household appliances, as well as aerospace, aviation, missiles, tanks and other military fields. In addition, they can also be used in computer mice, car mice, automotive electronic products, communication equipment, military products, as well as testing instruments, gas water heaters, gas stoves, small household appliances, microwave ovens, rice cookers, floating ball equipment, medical equipment, Building automation, power tools and general electrical and radio equipment, 24-hour timers.
The external mechanical force acts on the action reed through transmission elements (pressing pins, buttons, levers, rollers, etc.), and when the action reed is displaced to the critical point, an instantaneous action occurs, making the moving contact at the end of the action reed and the fixed contact point to switch on or off quickly.
When the force on the transmission element is removed, the action reed generates a reverse action force, and when the reverse stroke of the transmission element reaches the action critical point of the reed, the reverse action is completed instantaneously. The contact distance of the micro switch is small, the action stroke is short, the pressing power is small, and the on-off is fast. The action speed of the moving contact has nothing to do with the action speed of the transmission element.
Mainly used in the switches of some electrical components, such as computer mouse, car mouse, automotive electronic products, communication equipment, military products, testing instruments, gas water heaters, gas stoves, small household appliances, microwave ovens, rice cookers, floating ball equipment, Medical equipment, building automation, power tools and general electrical and radio equipment, 24-hour timers, etc.
Precautions for using micro switches
1) When fixing the switch body, please use M2 small screws on the smooth surface with a torque of 0.098N·m or less. In addition, in order to prevent the screw from loosening again, it is recommended to use a washer at the same time.
2) Please note that in the free state, the action body should not directly exert force on the button or the inciter, and the force should be applied in the horizontal direction to the button when using it.
3) The operation setting after operation is based on 70[%] or more of the O.T. value. In the case of a switch, do not set the operating body at the operating limit position to prevent the life from being shortened by the opening and closing and over-travel caused by the impact.
4) In the case of hand soldering, please use an electric temperature of 320°C with temperature adjustment, and complete the work within 3 seconds, and be careful not to apply force to the terminal part during the work.
5) It is recommended to use a low-power circuit type when used under a small current and voltage.
