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Micro switch is a small contact interval and fast moving mechanism, with the specified stroke and the specified force switch action contact mechanism, cover with the shell, its external drive rod a switch, because the contact distance of its switch is relatively small, so the name micro switch, also known as sensitive switch. Also known as sensitive switch, fast switch. Pressure actuated quick open/close. Used for door switch in anti-theft system.

Introduction of the term

Microswitches, as the name implies, use a very small force switch. It is a switch that the fixed contact at the end of the reed is quickly connected or disconnected by the external mechanical force acting on the moving reed through the transmission element.The micro switch has a micro contact interval and a quick action mechanism, and a contact mechanism for switching action with a specified stroke and force is covered by a shell, and the external transmission device is smaller in appearance. The micro switch consists of five major components. The distance between contact points is small and the torque is large. General external drive rod.

The working principle of

The external mechanical force is applied to the action reed by the driving element (press pin, button, lever, roller, etc.). When the displacement of the action reed reaches the critical point, it will produce instantaneous action, so that the moving contact at the end of the action reed can be quickly connected or disconnected from the fixed contact. When the acting force on the drive element is removed, the action reed generates the reverse action force. When the reverse stroke of the drive element reaches the critical point of action of the reed, the reverse action is completed instantaneously. The contact distance of micro switch is small, action stroke is short, press power is small, on and off quickly. The action speed of the moving contact has nothing to do with the action speed of the drive element.

Switch classification

There are many kinds of micro switch, hundreds of internal structure, according to the size of the ordinary type, small, super small; According to the protection performance, waterproof, dustproof, explosion-proof type; According to the broken form, there are single – link, double – link, multi – link. There is also a strong break micro switch (when the switch reeds do not work, external forces can also make the switch disconnect); According to the breaking capacity, there are ordinary type, dc type, micro – current type, large – current type. According to the operating environment, there are normal type, high temperature resistant type (250℃), super high temperature resistant ceramic type (400℃). The micro switch is generally based on the basic type without auxiliary pressing accessories, and derives the small stroke type and the large stroke type. According to the need to add different auxiliary pressing auxiliary parts, according to the addition of different pressing auxiliary switch can be divided into button type, reed roller type, lever roller type, short arm type, long arm type and other forms. In size there are small, super small, super small and so on. Function has 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 varies with high capacity and low load.

(2) micro micro switch

The general size is 19.8 by 6.4 by 10.2, with different functions of high precision and high life.

(3) super small micro switch

The general size is 12.8 long, 5.8 wide and 6.5 high.

(4) waterproof type

Switching applications

Micro switch in frequent exchange circuit device for automatic control and safety protection etc., are widely used in electronic equipment, instrument and meter, mine, electric power system, household electrical appliances, electrical equipment, as well as aerospace, aviation, warships, missiles, tanks and other military areas, has been widely used in the above areas, switch are small, but plays an irreplaceable role.

The current domestic market of micro switch according to different application requirements, the switch of mechanical life with 3 w to 1000 w, generally speaking, there are 10 w, 20 w, 50 w, 100 w, 300 w, 500 w, 800 w, the domestic general use beryllium bronze, tin bronze, stainless steel wire do reed, foreign ALPS highest can do 1000 w times, their reed is made of rare metal titanium.

Can be used in such as computer mouse, car mouse, automobile electronic products, communications equipment, military product, test instrument, gas water heater, gas burner, small home appliance, microwave oven, electric rice cooker, floating ball supporting equipment, medical equipment, building automation, electric tools and general electric, and radio equipment, 24 hours timer.


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