Overview

Micro switch is a pressure actuated rapid switch because the switch contact spacing is small, hence the name micro-switches, also called sensitive switches. Electrical symbols for: SM

Working principle

External mechanical power through the transmission elements (PIN, button, lever, wheel, etc) will force action on Reed, when Reed displacement to the limit results in instantaneous action, touch points and at the end of the Reed contacts quick connect or disconnect.

When the driving force on the components removed, Reed reverses the action force, when the transmission elements reverse stroke reaches the Reed point, instantaneous counter movement. Micro switch contact spacing is small, short trips, small power, switching rapidly. Its movement speed with the transmission components of the moving contact speed is irrelevant.

Type

A wide variety of micro-switches, internal structure there are hundreds, according to score common, small, very small; according to the protective properties of points, has water-proof, dust-proof, explosion-proof type; by breaking form, there are single, double, even more. Yet there was a strong disconnect the micro switch (when the Reed switch does not work when external forces but also enable switch is off), breaking capacity, there are ordinary type, DC, micro currents, high current type. By using environment, standard, high temperature (250 c), ultra high temperature ceramic (400 c)

Microswitch-free auxiliary press attachment for basic type and derived a small program, large programs. Different auxiliary press accessories can be added as needed, according to the press the accessory switches can be divided into different push button, spring roller and lever wheel-type, long and short boom boom and other forms.

Micro-switch in the desired frequency switchover circuit for automatic control and protection devices, such as, are widely used in electronic equipment, instruments and meters, mining, and electric power systems, home appliances, electrical equipment, as well as aerospace, aviation, ships, missiles, tanks and other military areas, is widely used in the above areas, switches may be small, but plays an irreplaceable role.

Currently domestic market Shang of micro moving switch according to using requirements of different, switch of mechanical life has 3W times to 1000W times ranging, General has 10W, and 20W, and 50W, and 100W times, and 300W times, and 500W times, and 800W times, domestic General using bronze, and tin bronze, and stainless steel silk do Reed, abroad of ALPS Supreme can do 1000W times, they of Reed is with metals titanium made of. The rise of domestic electronic WK-01B the highest production can also reach 1000W.

Range of application

Computer mouse, mouse of automobile electronic products, communications equipment, defense products, test equipment, gas water heater, gas stove, small appliances, microwave oven, rice cooker, float, building automation equipment, medical devices, power tools, and general electrical and radio equipment, 24 hours timer.