Also found in: Dictionary.
a small two-position or three-position switch operated by an arm-and-spring mechanism. Tumbler switches are mainly used for switching the control circuits (less frequently, the power-supply circuits) of electrical apparatus, instruments, and devices and electronic apparatus. They are usually mounted on control panels, switchboards, or consoles. The maximum permissible voltage for a tumbler switch is 380 volts, and the maximum current is 3 amperes.