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Pushbutton switches are a type of electrical switch commonly used in variety of electronic applications, from simple momentary on/off buttons to complex multi switch fader systems. These switches come in a wide range of styles, sizes and configurations, but the most common type is the single pole, single throw (SPST) switch. This type of switch is very basic, consisting of two contacts and a single actuator (aka the button or knob) that when pressed, causes the two contacts to open or close an electrical circuit. This type of switch is ideal for controlling simple devices, such as powering on/off a single light or computer peripheral.

Beyond the simple SPST switch manufacturers also offer double pole, double throw (DPDT) switches. These switches consist of 4 contacts and 2 actuators, offering greater flexibility than an SPST switch. DPDT switches are especially useful when both activating and deactivating a circuit are required. For example, many power tools use double pole, single throw (DPST) switches to turn the power on and off as well as to reverse polarity.

In addition to toggle and pushbutton switches, there are also larger types such as rotary and level switches, which enable the user to make multiple selections at the same time. Rotary switches are available in various configurations, with the most common being single pole, multiple position (SPMP) and dual pole, multiple position (DPMP) switches. These types of switches are ideal for circuit selection or setting adjustments as typically found on electronic equipment, such as power amplifiers.

Level switches are heavy duty devices typically found in industrial applications where a large load is being switched. Level switches are constructed with several sets of contacts that are aligned in a row. As the level of the material being switched increases, the actuator moves along the contact row, activating a series of contact points. When the level reaches a certain point, all of the contacts are engaged and the circuit is completed.

Aside from their use in controlling the flow of electricity, pushbutton switches can also be used to provide feedback to the user. A single pole, double throw (SPDT) switch is commonly used to provide an audible sound when a button is pressed, many call this a click switch. Another type of feedback, visual feedback, can be achieved through the use of illuminated pushbutton switches, in which the button itself is lit up to indicate an activity or current state of the circuit.

It is important to select the right switch for an application, as not all switches will be suitable. Knowing the application field and the switch’s working principle can help you make the right selection. Doing so will help ensure that the switch performs as expected and that it has the appropriate features for the application. When selecting a switch, it is important to take into account the operating conditions, including voltage and amperage requirements, and any environmental factors that may affect its performance.

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