Switch Rotary Knob Off/On/On

A rotary switch has a turn-knob type of actuator that is rotated clockwise to make the circuit contact, and turned again in either the same or opposite direction to break the contact. Single pole, double throw (SPDT) is a three terminal switch that controls two single-wire circuits, permitting only one circuit to be energized at a time. It is commonly used in pairs and sometimes called a three-way switch.