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Pushbutton Switches

1.22.114.392/0200 Application Field and Working Principle

Pushbutton switches are used in a variety of applications, ranging from industrial to consumer products. They are employed to control electrical devices such as motors and lighting, activate alarms and other notification systems, as well as functioning as a part of larger automation systems. The main components in a pushbutton switch arrangement include a switch body, electrical contacts, actuators and control circuitry. The types of pushbutton switches available vary in form, function, range and size.

Pushbutton switches are rated according to their current capacity and voltage requirements. The most commonly encountered rating is 5 amps at 125/250 volts AC. The contacts in pushbutton switches are typically composed of a form of silver or other corrosion resistant metal and the actuators are normally constructed from plastic materials. The design of the switch can be tailored for a wide variety of uses, with different switching mechanisms available for momentary or maintained contact operation and a wide range of approved marking options.

When a pushbutton switch is operated, a change of state occurs between its contacts. The application of a certain amount of force to the actuator is what creates the change in state. With momentary contact switches, the contacts will return to their original state after the operating force has been removed. With maintained contact switches, the contact state can be changed back to its original state by operating the switch a second time. The contact elements are normally maintained in a sealed chamber, allowing the switch to provide reliable operation exposed to dust or other environmental influences.

The actuators of the switch also play an important role in the operation of the switch. There are various types of actuators, including toggle or lever switches,rocker switches, and miniature snap action switches. All of these provide a form of operating force to effect the change of state. The size of the actuator can vary, from full size toggle switch up to miniature pushbutton switches, which are often employed in modern electronics products.

Pushbutton switches can be wired in a variety of ways. Momentary contact switches can be wired for normally open or normally closed operation, depending on the desired application. Similarly, maintained contact switches can be wired for momentary, maintained changeover contact operation. This is useful in applications where a single switch is used to activate multiple functions.

In conclusion, pushbutton switches provide a convenient yet reliable method of controlling a variety of electrical devices. They are an essential component in many automated control systems, and exist in a range of sizes, contact ratings and capabilities. The design of the switch, the choice of contact material, the actuator type and the wiring configuration of the switch, allow it to be tailored for a wide range of applications, both in industrial and commercial settings.

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