YIDI offers various Toggle Switch with SPDT, SPST, DPDT, DPST functions and multiple actuator and bushing options. YIDI toggle switch is actuated by a moving a lever back and forth to open and close an electrical circuit. TYIDI offers various Toggle Switch with SPDT, SPST, DPDT, DPST functions and multiple actuator and bushing options. YIDI toggle switch is actuated by a moving a lever back and forth to open and close an electrical circuit. They come in different size, from miniature PCB mount up to power rated panel mounted switches. hey come in different size, from miniature PCB mount up to power rated panel mounted switches.