Examples of common switch schematics found on a datasheet (in order: SPST, SPST, SPDT, DPDT, DPST, DPST) Key Push Button Switch SpecificationsĬonsulting datasheets will allow for information on specific push button switch models to be compared with one another. For instance, where one is high voltage and the other is low voltage. DPST and DPDT switch arrangements allow for the simultaneous control of two isolated 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. An SPDT has three terminals and can thus control two different circuits. For example, it might be used to turn a motor on and off. An SPST has just two terminals, so it can only open and close a single circuit. These are commonly single pole, single throw (SPST), single pole, double throw (SPDT), double pole, single throw (DPST), or double pole, double throw (DPDT). Within this classification, the functionality of push button switches can further be defined in terms of the switching circuit they utilize. Normally open (“OFF” position) switches complete the circuit when actuated, while normally closed (“ON” position) switches break the circuit when actuated. Push button switches can be classified as being normally open (NO) or normally closed (NC). 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). Alternatively, they can provide an input for the user interface of a piece of equipment or start/stop a particular function. They can be employed to break (off) or initiate (on) a circuit. Push button switches rely on a simple in-out actuation mechanism. Example of a push button switch How Does a Push Button Switch Operate? They come in a variety of shapes, sizes, and configurations, depending on the design requirements. What is a Push Button Switch?Ī 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. This short blog will give an overview of push button switches including their basic operation, common types, and key design specifications. Push button switches, also referred to as pushbutton switches, push switches, or simply push buttons, are prevalent in a multitude of modern applications. Mechanical switches can be reliant on a variety of different potential actuation methods, depending on the purpose they serve.
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