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Snap action, limit switches are the most common type of electrical switch. They are designed to operate at specific predetermined limits, either opened or closed. They are used in a wide variety of applications ranging from home appliances, commercial and industrial systems, and automotive applications. They are used to control electrical systems in order to ensure proper functioning.

The purpose of a snap action, limit switch is to provide a reliable switching action with repeatable positive activation. This type of switch is designed to open and close its contacts in response to the movement of an actuating arm or lever. The actuator mechanism is designed such that when a preset force is applied to the actuator arm, the contacts are opened or closed. This consistent activation ensures that the switch can perform its desired function reliably and consistently.

These switches are typically used in applications such as door open/closed sensors, light dimmers, stoves and ovens, refrigerator and freezer temperature control, and automated machinery. They are also commonly used in security systems to detect the presence of an intruder or to alert an alarm system of a breach of security. In addition, they are often used in vending machines, as well as in diagnostic medical equipment.

Snap action, limit switches are usually characterized by their mechanical and electrical parameters. The mechanical parameters of the switch include actuation force, actuation time, reset time, contact rating, and actuation speed. The electrical parameters include voltage rating, current rating, and switching characteristics. Depending on the application, different combinations of these parameters are selected to ensure that the switch meets the requirements of the system.

The other important factor to consider when selecting a snap action, limit switch is the environmental conditions that it will be exposed to. These switches are typically rated for use in dry, damp, or wet environments. In addition, they may be rated for use in environments with corrosive chemicals or high temperature. It is important to select the right switch for the environment it will be used in, to ensure the reliable operation of the system.

The principle of operation of a snap action, limit switch is relatively simple. The switch body contains a pair of contacts, one is normally open and the other is normally closed. When an external force is applied to the actuator arm, it moves the contacts to the opposite position, either opening the normally closed contact or closing the normally open contact. This action is always repeated when the actuator is returned to its original position.

In summary, snap action, limit switches are widely used in a variety of applications. Their design and operation allow them to be used in a wide range of environments, and they are capable of providing reliable operation over extended periods of time. They are relatively simple devices and are available in a range of mechanical and electrical parameters to suit a variety of applications. When selecting a switch, it is important to consider the parameters required and the environment in which it will be operated.