WINOMO Mini Micro Limit Switch Roller Lever Arm SPDT Snap Action LOT 10 Pcs These Micro Switches features Single Pole Double Throw (SPDT) Type, 1NO + 1NC Contact, Momentary Action, Hinge Roller Lever Actuator. Easy installation and long using life. Widely used in electronic equipments, Microwave Micro DoorOvenRefrigerator Interlock NO NC Switch etc. In snap action contacts, the movement of the actuator applies force to an overcenter mechanism. This mechanism creates a quick change in contact state when the trip point is reached. Overall Size(Pole not included) : 20 x 6 x 10mm 0.8" x 0.2" x 0.4" (L*W*H). Reversing the motion of the actuator to a given reset point causes the contacts to snap back to their original position.