Microswitches

What are the physical principles applied within a variable transformer?

Many microswitches have a construction that employs a wheel stationed above a push-button actuator. The actuator is depressed, lifting a lever that move the contacts into the desired position. Most of these switches are momentary switches. This means that, once the actuator is released, the switch returns to its normal state. This is accomplished by way of springs. The springs keep the actuator in position and the contacts in their normally closed or opened position. When depressed, a weaker flat spring in the device moves the contacts, but is moved back into place when the switch is released.

Microswitches make a distinctive clicking noise when they are actuated, This can provide tactile feedback for testing the switch. The internal mechanisms are simple enough, and secure enough in their casings, that they can be installed in very demanding environments and still function reliably. To further guarantee performance, specific materials may be chosen for the contacts and the switches can be chosen based on their ability to repel the intrusion of environmental hazards, which is described below.

These switches are usually provided with a couple of holes on the case that are used to fasten them to whatever surface or appliance is required. The switches are commonly small, rectangular components, completely self-contained, that require no maintenance. Their low cost makes it easy enough to replace them when they wear out, which happens rarely, at best.

Microswitches will be differentiated by their normal state, the number of poles and throws that they have and the type of case that they are situated in. There are designs that are intended to be used on printed circuit boards and designs that can be fastened into place with a hex nut. The compact size and reliability of these components means that there are many varieties, as there are many uses for microswitches.

Microswitches are also differentiated by their electrical characteristics. These are small devices and generally only designed to carry low current and voltages. There are designs that are intended to be used in more demanding applications, however.