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Pushbutton switches are commonly employed devices for controlling everyday objects and processes, with potential application fields ranging from home appliances and installations to industrial automation. The basic idea behind them is to provide a switch-like control that can be used to manually control the flow of electrical signals or currents.

In general, a pushbutton switch is composed of several electrical terminals, either connected directly to the power source or to a relay, controller, or actuating system. A button-like surface, usually of plastic or metal, is connected to a frame where a contact may be provided, depending on the switch type. In general, a single pushbutton switch is capable of providing two positions, which might correspond to turns on/off, open/close, start/stop, or similar options. Various switch types may be used, such as momentary, toggle, maintained, bistable, and rotary. Pushbuttons may also be used to provide a wide range of functions within a single switch, such as digital logic inputs or vector keys.

The basic working principle for pushbutton switches is similar to that of other common switches. When the button is pushed or depressed, the contact is made and the electrical signal or circuit is activated, or the device is caused to switch state or operation. When it is released or depressed again, the contact is broken and de-activated or switched back. Depending on the type of switch and wiring, the switch may stay in one position or switch back after being released.

Pushbutton switches may be used to control a host of actions in electrical and electronic circuits. They serve mainly as a direct user interaction tool, and allow for manual control of the activation and deactivation of a given circuit or element. Moreover, they are commonly used in combination with switches and controllers, such as relays, thereby becoming part of more complex automation systems. Pushbuttons can also be used to control machines in motion, providing a pause or reset mechanism when needed.

In conclusion, pushbutton switches are a popular and a universal form of control element found in many applications. The basic concept is to provide a simple switch to manually control the flow of electricity or signals. The switch contacts, type and wiring determine the function of the switch, and their application fields range from home appliances to industrial automation. Pushbutton switches are usually found in combination with controllers and switches to create complex systems, and their main purpose is to provide direct user interaction.

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