the inner wall the contact control device 40 includes a convex hole 41 an elastic part spring 42 is placed in the convex hole 41 a pair of protruding rods 44 are located on two opposite upper and lower sides of the contact control device 40 on end of the contact control device 40 forms an oblique actuating part 45 which has a vertically elliptic fixing hole 451 used to connect the contact control device 40 to the fixing pillar 36 of the switch body 30 additionally a hole 46 is located at a suitable place on the contact control device 40 a supporting rod 47 of the contact control device 40 is used to connect to the supporting rod hole 14 of the switch cover body 10 the contact control device 40 further includes an end part 50 which has a top support end 51 as a hook at one end the bottom side of the end part 50 contacts with the upper side of the stopper 35 of the switch body 30 a push plate 53 is included in the outer side of the top support end 51 a slot hole 52 vertically penetrates through the end part.