C & K Pin Plunger Snap Action Micro Switch, Solder Terminal, 1/2 A @ 125 V dc, 15 A @ 125 / 250 V ac, SPST

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C & K Lever Micro Switch, Through Hole Terminal, 3 A, SP-CO

C & K Lever Snap Action Micro Switch, Through Hole Terminal, 100 mA @ 125 V ac, 100 mA @ 60 V dc, SP-CO


Micro switches are mechanically operated electrical switches designed with an actuator and terminals called common, normally open, and normally closed. A micro switch is also known as a snap action switch, they operate by using a spring-loaded lever to open and close a set of internal contacts inside the unit.

### How does a micro switch work?

Power is typically attached to the common terminal, this leads into the switch and energizes the spring and because the spring is touching the normally closed pin it sends power out here, this is called a resting state. Once the arm is moved the power is then transferred to the normally open pin.

### Where would you find them?

Micro switches are differentiated by their electrical characteristics. These are small devices and generally only designed to carry low currents and voltages. These switches are very commonly employed as safety devices, as they are reliable, inexpensive, and can open up a circuit when needed, preventing a machine from being turned on or a door from closing when someone is in the way.

### Actuator types

There are various types available but the operating principles are the same, switches are actuated by a plunger, a button, a roller, or a lever.

### What is their operating life?

Micro switches operating life is generally very high, being measured in millions of cycles, in most cases. Consumer products generally have lighter-duty micro switches than industrial products, but the low cost of these parts makes it easy enough to upgrade to higher mechanical life expectancies when required or when it's simply beneficial to do so.

### What type of applications need micro switches?

Micro switches are used in consumer devices and industrial equipment. A common application for these devices is in door interlocks, microwave ovens, or where a door must be shut before the power to the device will turn on. Micro switches are also used in levelling devices, such as those used on vending machines. In an elevator, these devices are used in the door as a safety switch.

Micro switches can be designed to be very sensitive. Such designs can be used in very precise equipment, such as that which measures the flow of air or other gasses through a system. These devices are used extensively in industry, often in control circuits.



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