A rotary switch is a switch operated by rotation. These are often chosen when more than two positions are needed. Modern rotary switches use a star wheel mechanism to provide the switching positions, such as at every 30, 45, 60, or 90 degrees. Nylon cams are then mounted behind this mechanism and springloaded electrical contacts slide around these cams. The cams are notched or cut where the contact should close to complete an electrical circuit. In electrical engineering, a switch is an electrical component that can disconnect or connect the conducting path in an electrical circuit, interrupting the electric current or diverting it from one conductor to another. The most common type of switch is an electromechanical device consisting of one or more sets of movable electrical contacts connected to external circuits. When a pair of contacts is touching, current can pass between them, while when the contacts are separated no current can flow. Features. 5Position Rotary Switch. Made with high quality materialSpecifications. Length 1.5. Width 2.95. Height 1.45