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Switches are devices used to interrupt the flow of electrical current in one or more circuits, under the direct physical control of some outside mechanism such as a user's finger or thumb, a magnet, or a moving machine component. Organization of sub-groups within the category occurs along lines of the physical style or form of switches' actuators, or a particular application or purpose for which they are designed.

Image of SPST-NO schematic symbol Image of Normally Open schematic symbol Image of SPDT schematic symbol Image of DPST-NO schematic symbol