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Pushbutton switches are one of the most common types of switch used in electrical circuits. This type of switch has a series of contacts, a switch actuator, and a variety of other components that allow an electrical current to be controlled. The primary purpose of a pushbutton switch is to control an electrical current, either on a temporally basis, or when triggered by an external event.

The series of contacts used in a pushbutton switch work as follows: When the actuating button is pressed, the contacts close and allow an electric current to flow. Once released, the contacts open and the current stops flowing. This simple system is at the heart of a pushbutton switch, and is the basis for other types of switch designs.

Pushbutton switches can be divided into several categories, depending on the type of contact and actuator. The most common contact types are the single-pole, single-throw (SPST), double-pole, single-throw (DPST), single-pole, double-throw (SPDT), and double-pole, double-throw (DPDT) pushbutton switches. Depending on the type of contact, these switches can be used for controlling a variety of functions in electrical systems, including power, port selection, and voltage.

The type of contact used in a specific pushbutton switch is determined by the application in which the switch is to be used. For example, a single-pole, single-throw pushbutton switch is typically used to control an on/off function in an electrical system, such as a light switch. In contrast, a single-pole, double-throw pushbutton switch can be used to control two circuits at the same time, such as a doorbell switch that opens and closes a doorbell chime.

The actuator used in a pushbutton switch is also important in determining the type of application. The most common types of actuator include flat blade, disc style, rocker, and push-button switches. Flat blade and disc switches are typically used in low-voltage circuits, while rocker and push-button switches are commonly used in high-voltage circuits.

Pushbutton switches are commonly used in a variety of industrial, commercial, and residential applications. Common applications include doorbells, security systems, emergency stop circuits, and audio equipment. In addition, they can be used to control lights, appliances, and other electrical devices in the home.

The most important factors in selecting a pushbutton switch are the application, contact type, actuator design, and safety concerns. Pushbutton switches offer the convenience of controlling an electrical current without the need for hard wiring. Their low cost and low-complexity makes them an ideal choice for a wide range of applications.

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