Snap Action Switches, also known as micro switches, are switch devices that are used to open or close an electrical circuit at a rapid speed. These highly sensitive switches are very often used in aerospace, appliances, vending machines, timing devices, office equipment, computer/business equipment, test instruments, HVAC systems, manually operated devices, and valves, among others.

21SX39-T Snap Action Switch from Honeywell is a sub-miniature basic micro switch. It is designed for simple on/off application needs. This Honeywell Snap Action Switch comes with a choice of actuation, electrical termination and operating characteristics to provide design flexibility. With an elongated mounting hole, this plunger switch enables more accurate and easy mounting.