Switches

Switches are used to allow electric current to flow when closed. When opened, they prevent current flow. Common switch types include pushbutton, rocker, toggle, rotary coded DIP, rotary DIP, key lock, slide, snap action, and reed. Pole and throw configurations for switches include single pole single throw (SPST), single pole double throw (SPDT), double pole single throw (DPST), and double pole double throw (DPDT). 

Pushbutton switches are mechanical devices where the activation method, typically in the form of a plunger, is pushed down to open or close the switch. Rocker actuators are familiar in many on-off switches; they rock or pivot about the centerline, and include both maintained and momentary contact types. By contrast, toggle switches have a toggle that moves or swings to make or break the circuit. 

Rotary coded DIP switches are activated by means of a rotating shaft that can have several stop positions. For each position of the shaft (the input), the switch generates an output binary code. Dual in-line package (DIP) switches are circuit boards with a series of tiny switches. Typically, DIP switches are used in computers and computer peripherals such as modems. Rotary switches move in a circle, and can stop in several positions along their range. Key lock switches are activated by a key that is turned in a circle, and that can stop in several different positions. 

Slide switches have a slider that moves linearly from position to position. A snap action switch is a mechanical switch that produces a very rapid transfer of contacts from one position to another. These switches are useful in situations that require a fast opening or closing of a circuit, such as a mouse button or appliance setting. Reed switches are magnetically-activated switches. Typically, they are manufactured with two ferromagnetic reeds (contact blades), which are sealed in a glass capsule. In the presence of a magnet, the blades (contacts) close. 

Important electrical switch specifications to consider when searching for switches include maximum current rating, maximum AC voltage rating, maximum DC voltage rating, and maximum power rating. Other important parameters to consider when searching for switches include the terminal type, construction materials, common features, and environmental conditions.

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Part Numbers for Switches