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Snap action and limit switches are a kind of switch that can detect the starting or stopping of a machine or process in a sensing environment. They are widely used in many applications like security alarms, fire alarms, vending machines, and medical equipment. They are designed to detect the start or stop of a certain process and then trigger an action, thus helping to control the process more accurately and efficiently.

The snap action switch is usually composed of a button, actuator, lever, plunger and a contact arm. These parts move together in response to a force or an electrical current, known as an input. When the input crosses a predetermined level, the switch triggers a mechanical action that causes the contact arm to move and ultimately make contact with an output terminal. This can either close or open the circuit, depending on the type of switch.

The snap action switch works on the principle of electromechanical energy conversion, which is the concept of converting the energy from one form to another. The input energy is converted into mechanical energy, which in turn triggers the contact arm to move and make contact with the terminal. This mechanical action is then converted back into electrical energy in order to either close or open the circuit.

Limiting switches are similar to snap action switches in that they both act as gatekeepers to ensure that processes only start or stop once the required conditions are met. The difference between the two is that limiting switches are used to limit the motion of a component by enforcing an upper and lower travel limit. This prevents overtravel, which could result in an unsafe situation or even damage to the component.

Limiting switches work on a similar principle to their snap action counterparts but they detect the position rather than the force or current. The input is evaluated, and when it meets the predetermined set points, a mechanical contact is triggered to indicate the stop or start of a process. This enables the operator to ensure that the component is only positioned within a specific range.

In summary, snap action switches and limit switches are both very useful in modern industrial applications. They are used to detect the start or stop of a process and then trigger an action, as well as to limit the motion of certain components to ensure an even and safe operation. As such, these kinds of switches are essential for controlling any kind of process or machine.

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