Abstract: Embodiments relate generally to a limit switch comprising a switch housing; a contact block assembly comprising a contact plunger and a switch circuit; a head assembly comprising a lever; a reset plunger configured to fit within the housing, configured to interact with the head assembly and the contact plunger; and a reset assembly comprising a reset button and a reset axis, configured to attach to the housing and to interact with the reset plunger, wherein the head assembly moves the reset plunger downward against a bias, wherein, when the reset plunger is moved down a predetermined amount, the reset axis moves into an opening in the reset plunger, due to a bias on the reset axis, wherein when the reset plunger moves downward, the contact plunger also moves downward against a bias, and wherein the contact plunger is configured to control the switch circuit.

Abstract: An electric circular saw includes a housing, a switch trigger arranged on the housing, a switch controlling rod for limiting the travel range of the switch trigger, a base plate, a depth support arranged on the base plate and a connecting rod for limiting the travel range of the depth support. The electric circular saw further includes an movable control member having a driving portion for driving the first connecting rod and a limiting portion for limiting the switch controlling rod, and the moving distance from the driving portion to a contact surface between the driving portion and the first connecting rod is larger than or equal to the moving distance from the limiting portion to a contact surface between the limiting portion and the switch controlling rod.