threeposition

Threeposition refers to a class of switches or controls that provide three distinct positions accessible by a single actuator, such as a toggle, slide, or rocker. The arrangement is commonly used to select between two circuits or modes, with a central position that serves as a neutral or off state in many designs.

In electrical terms, threeposition switches are often SPDT (single-pole, double-throw) or DPDT (double-pole, double-throw) variants. They can be maintained (latching), holding a chosen position until moved again, or momentary (spring-return to a default position). A typical threeposition configuration is on-off-on, where the center position disconnects the circuit or provides a separate function, and the two outer positions connect the common terminal to one of two outputs. Some designs use a center-off with two active outer positions, while others offer three active states with different modes rather than a neutral state.

Common applications include control panels, audio equipment, lighting consoles, automotive dashboards, and industrial instrumentation. Threeposition switches enable simple mode selection, channel switching, or power routing without requiring multiple controls. Actuator styles vary, including toggle switches, slide switches, pushbutton toggles, and rocker variants, each with different panel cutout and mounting requirements. Electrical ratings for threeposition switches span a wide range, from low-current signaling to higher-current power applications, and selection depends on the required current, voltage, environmental conditions, and mechanical durability.