Components and Connection of Toggle Switches
A toggle switch consists of a lever, spring, O-rings, plunger, moving armature, case and base. The types of connections a switch can make depend on its essential components like pole and throw.
What are poles and throws?
In electronics, the terms pole and throw are used to describe switches contact variations. The number of “poles” is the number of electrically independent switches controlled by a single physical actuator. For example, a “two-pole” switch has two separate, parallel sets of contacts that open and close simultaneously by the same mechanism. The number of “throws” is the number of separate wiring path choices other than “open” that the switch can adopt for each pole. A single-throw switch has one pair of contacts that can either be closed or open. A double-throw switch has a contact that can be connected to either of two other contacts, a triple-throw has a contact which can be connected to one of three other contacts, etc.
The type of switch connection depends on its basic components, such as poles and throws. The poles of switches are the individual power sources controlled through each switch, and the throws are the different positions available to the switch like on/off.
There are four basic types of these toggle switch connections, each including different pole and throw combinations – single pole single throw, single pole double throw, double pole single throw or double pole double throw.
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