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Pushbutton switches are used in a variety of applications, from controlling the flow of electrical circuits to powering high-voltage machinery. The most common kind of pushbutton switch is the momentary type, which uses spring-loaded contacts to switch the device on or off. Momentary switches are available in single-pole (SPST) or double-pole (DPST) configurations.

A single-pole switch contains one movable contact and one stationary contact. When the switch is pressed, the movable contact moves to the closed position and completes the circuit so that power can flow. A double-pole switch contains two movable contacts and two stationary contacts. When it is activated, both contacts move to the closed position, creating a double circuit that runs in parallel. The double-pole configuration allows for more complicated wiring applications and can be used to control two different circuits.

In addition to the momentary type, pushbutton switches also come in alternate-action or maintained-contact configurations. An alternate-action switch contains two sets of contacts, one movable and one stationary. When the switch is pushed, the movable contact moves to the closed position, and when it is released it moves back to the open position. A maintained-contact switch behaves in a similar way, except that it stays in the closed position until the user manually resets it.

Pushbutton switches are commonly used in household appliances, such as microwaves, toggling various functions on and off. They are also used in industrial settings, to activate relays, or to provide operator control for machinery. These switches are reliable and easy to use, making them a popular choice for applications that require on/off operation.

The working principle of pushbutton switches relies on the spring-loaded contacts and the mechanical contact closure of the movable portion. When the switch is pressed, the movable contact is forced against the stationary contact, making an electrical connection. This connection acts as a switch, allowing power to pass through. The spring then returns the movable contact to its original position, and the circuit is opened. The mechanical operation of a pushbutton switch is very reliable, as the contacts are designed to make consistent contact with each other and reduce the risk of arcing or sparking.

Pushbutton switches have become ubiquitous in modern technology and industrial applications, due to their affordability, ease of use, and reliability. They are available in a variety of sizes, configurations, and contact rating, allowing the user to select the best switch for their specific application. Furthermore, with the advent of electronic switching, many pushbutton switches now have additional features, such as LED indicator lights and lights that alert operators when a switch has been activated.

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