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Snap Action, Limit Switches

A snap action switch, also known as a limit switch, is used in a wide range of applications. This type of switch is used to detect or limit motion of a machine, specifically when a certain position or limit has been reached. The device works by turning on or off an electric circuit when a specific amount of motion is detected. Snap action switches detect and limit a wide range of behaviors, from rotating a machine arm or pallet to detecting running speeds and pressure.

Application Field

Snap action switches are used in a wide range of applications, from industrial and manufacturing uses to control mechanisms and home appliances. They are found in many types of machines, such as conveyors, hoists, industrial process controls, pumps, robotics, and many other equipment. They are also used to detect and limit the operation of a machine, thereby preventing damage to the machine or to personnel operating the machine. In addition, snap action switches are also used to detect off-limit positions of a machine.

Working Principle

A snap action switch is generally composed of a movable actuator, one or more contact blocks and a force return coil. When the actuator moves, it triggers a mechanism that forces the contact blocks to open or close the switch. This action changes the status of the circuit, either turning it on or off, depending on the position of the switch. The opening or closing of the switch is referred to as "swapping". This swapping action causes a voltage or current change, which is then detected by a controller.

The motion or speed of the actuator is controlled by the force return coil, which helps to maintain the switch in a stable state. If the force required for the movement is too strong and sudden, the actuator will be forced back to its original position. When this happens, the switch remains unchanged in its original state.

Snap action switches generally do not require maintenance and can operate reliably in temperatures ranging from -20 °C to +85 °C. They come in many shapes and sizes, with corrosion-resistant materials including brass, steel and aluminum.

Conclusion

Snap action switches are used in a wide range of applications, from industrial and manufacturing uses to home appliances. They detect and limit motion by turning on or off an electric circuit when a specific amount of motion is detected. They are composed of a movable actuator, contact blocks and a force return coil that helps to maintain the switch in a stable state. They require no maintenance and can operate reliably in temperatures ranging from -20 °C to +85 °C.

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