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Snap action, limit switches are devices that attach to mechanical or electric components and detect the position of those components when activated. These switches use leverage to trip a contact from one position to another with a firm switch action that provides reliable contact operation. The contact trip is momentary and returns to its original position when released. Since the switch is activated by a rapid switch action instead of by a slowly changing electric or mechanical force, they are more reliable and less prone to failure.

The application fields of snap action, limit switches are many and varied. These are used in a variety of industries including automotive, aerospace, industrial automation, consumer electronics, and robotics. Typical applications include functions such as over-temperature protection, mechanical limit-stop control, power range setting, heavy-load protection, and custom control circuitry. In medical device applications, these switches are used for various tasks such as pump activation and pressure sensing.

The working principle for snap action, limit switches is simple. Depending upon the design, the switch may consist of one or two moving parts that make contact when moved. This contact triggers a signal that can be sensed. When the contact is broken, a second signal is triggered. Both of these signals can be electrical, mechanical, optical, or a combination of any of the three.

The design of the switch consists of the basic components of an actuator, a lever arm, a contact mechanism, and a base. The actuator is responsible for providing the mechanical power that move the switch parts. The lever arm is responsible for transferring the mechanical power to the contact mechanism. The contact mechanism consists of a set of contacts that are mounted to the base of the switch. When the actuator is activated, it moves the lever arm and the contact mechanism, allowing the contacts to make or break the electrical or mechanical connection.

Snap action, limit switches come in a variety of sizes and styles to suit the needs of various applications. There is a selection of sealable, non-sealable, normally open, and normally closed designs available to choose from. Typically, these switches are operated by the motion itself, but can also be operated by a separate controller or actuator. They are designed to be highly reliable and offer precise signals, and they can be used in extreme environments. Whether used for industrial, medical, automotive, or other applications, these switches offer reliable performance and long-lasting durability.