Rotary switch

A rotary switch, comprising:

• a base forming a plurality of contacts arranged in an arc array;
• a circular support apparatus installed in the base, and forming a zigzag first guiding portion undulating in a radial direction of the support apparatus, and a zigzag second guiding portion undulating in a direction perpendicular to the radial direction;
• and
• a rotary apparatus rotatably installed in the support apparatus, and comprising a rotary pole, a trigger extending down the rotary pole for contacting and triggering a selected one of the contacts, two abutting poles, and two resilient members respectively connected between two opposite ends of the rotary pole and the abutting poles, an end portion of each abutting pole opposite to the rotary pole movably received in the first guiding portion, to allow the abutting pole to stretch or withdraw in the radial direction of the support member, and the end portion of the abutting pole also movably received in the second guiding portion, to allow the rotary pole to undulate in the direction perpendicular to the radial direction, thereby the trigger contacting and triggering the selected contact in response to the abutting poles moving to a bottom of the second guiding portion, and the trigger passing over one of the contacts in response to the abutting poles moving to a top of the second guiding portion.