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Snap action and limit switches are both forms of electrical switches. Both types of switches are used in various applications and both have unique working principles. However, there are differences between the two types of switches and the application fields and working principles of each will be discussed in further detail.

Snap Action Switches

Snap action switches, also known as reed switches, actuate with a relatively small amount of force. These switches can be used for initiating an electrical contact when a spring loaded dome sticks. When the dome is pushed down, a plunger arm inside the dome causes the electrical contact to close. The plunger arm must reach a particular activation force threshold in order to properly actuate, at which point the plunger arm releases, creating a “snap” sound. This is where the term “snap action” switch comes from.

Snap action switches are known for their reliable, high-speed performance and are often used in applications such as automotive, medical, aerospace, and industrial automation. These switches are also used in vending machines, toys, and photography, among other applications.

Limit Switches

Limit switches are used to “limit” the motion of a machine, process, or system. These switches are often used as emergency stop buttons to prevent potential safety hazards. Limit switches will either open or close a circuit based on the limit or point that has been reached. The switches can be either mechanically, magnetically, or electromagnetically operated.

Limits switch are commonly used in applications such as machine automation and robotics, railway signaling, and elevators, escalators, and automated doors. They are also popular in consumer electronics and appliance, where they are used to ensure that the device is operating properly.

Conclusion

Snap action and limit switches are both popular in a wide range of applications and have different mechanisms for actuation and different working principles. Snap action switches use a plunger arm inside a spring loaded dome, while limit switches actuate when a particular limit or point is reached. Snap action switches are used in automotive, medical, aerospace, and industrial automation, while limit switches are popular for use in machine automation, robotics, railway signaling and consumer electronics. In both cases, the switches are effective tools to be used for a variety of applications.

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