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Snap action limit switches are electromechanical devices that consist of two or three main parts. The first part is a contact, often two contacts that are separated when the switch is in the off or open position. The second part is a mechanism that causes the contacts to close or open when some type of physical, electrical, or mechanical action is applied to the switch. The third part is a housing that surrounds the switch and contact points to keep them functioning properly in their environment.

The application field of a snap action limit switch is broad and depend on the types of switches available. The most common uses are found in industrial machinery and automated production applications. They are also used in a variety of commercial and residential applications. Snap action limit switches can be used as motion sensors, affixed in a circuit to indicate when the circuit has been triggered or when the power is switched off, used as a pressure sensor to indicate the presence of a specific pressure, and as a position position indicator to locate the on/off points of a device. They can also be used as a safety mechanism to shut down equipment or alert a user when a physical object or electrical parameter has exceeded preset values.

In terms of working principle, snapshots-action limit switches operate by a mechanical action between moving parts. When the moving part reaches a certain limit point or position, the contacts within the switch close. This closing of the contacts creates an electrical connection which activates the system or the circuit associated with the switch. When the moving part retracts from its limit point, the contacts open, breaking the electrical connection and deactivating the system or circuit.

The switch can also be operated by an external mechanism. This type of switch is known as a manually operated switch. This type of switch is used to control the operation of a system or circuit simply by closing the switch contacts. The most common use of such a switch is to enable or disable a device.

In terms of application field, some of the areas where snap-action limit switches are used include automotive control systems, security systems, home automation systems, robotics, motors, and other devices requiring precise limit detection and control. Some switches can be used with both AC and DC voltage circuits. Other types are designed for use with wire mesh sensing contacts. Such switches are suitable for high-temperature applications.

Snap action limit switches provide a reliable and convenient solution to detect and control several parameters in different applications. They offer flexibility in use, design, and cost efficiency. Therefore, they are extensively used in a wide range of industries.