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A push button switch is a mechanical device used to control an electrical circuit in which the operator manually presses a button to actuate an internal switching mechanism. They come in a variety of shapes, sizes, and configurations, depending on the design requirements.
How Does a Push Button Switch Operate?
Push button switches rely on a simple in-out actuation mechanism. They can be employed to break (off) or initiate (on) a circuit. Alternatively, they can provide an input for the user interface of a piece of equipment or start/stop a particular function.
Push button switches may be categorized as being either momentary (where the switch function only continues for as long as the operator is pushing the button) or maintained (where the switch function stays latched in that status after it has been actuated).
Types of Push Button Switches
Push button switches can be classified as being normally open (NO) or normally closed (NC). Normally open (“OFF” position) switches complete the circuit when actuated, while normally closed (“ON” position) switches break the circuit when actuated. Within this classification, the functionality of push button switches can further be defined in terms of the switching circuit they utilize.
These are commonly single pole, single throw (SPST), single pole, double throw (SPDT), double pole, single throw (DPST), or double pole, double throw (DPDT). An SPST has just two terminals, so it can only open and close a single circuit. For example, it might be used to turn a motor on and off. An SPDT has three terminals and can thus control two different circuits. Therefore, it may be used to flip between the powering of two separate LEDs or for moving an item of equipment from a sleep mode to an active state. DPST and DPDT switch arrangements allow for the simultaneous control of two isolated circuits. For instance, where one is high voltage and the other is low voltage.
Push Button Applications and Considerations
Push button switches have been around for quite some time and might be most well-recognized for their use in classic arcade machines. However, their use is widespread in various applications, such as vending machines, portable equipment, household appliances, power tools, and countless other consumer electronics and industrial controls.
Conclusion
Push button switches are one of the most common types of switches that users and consumers interact with on a daily basis. While a relatively straightforward switch component, push button switches still offer a range of sizes, specifications, and features that need to be understood and considered based on the final application. CUI Devices offers a range of mini push button switches with compact packages, multiple switch functions, and several circuit types.
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