KC1901A by E-Switch is a rotary switches designed for reliable performance in electronic applications. It is widely used in industrial, automotive, and power management systems.

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.