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Snap Action, Limit Switches are electromechanical devices that can be used to open or close an electrical circuit or act as an interrupter. Generally, these switches are composed of a stationary electrical contact and a moving mechanical armature. The armature, when moved by an external force, whether mechanical, electrical, or magnetic, will cause the electrical contacts to open or close. This action is referred to as a "snap action," and is controlled by the throw of the armature. Apart from its most simple application, that of an on/off switch, its uses are almost endless, ranging from the detection of pressure, gas concentrations, level sensing, flow control, and vibration.

In their most basic form, snap action, limit switches are push-button switches that are typically used on joysticks and control panels to provide a range of motion to a device. The switch is configured to break or make an electrical contact when the armature is pushed in a particular direction. This type of switch is commonly used to control motion in machines, as well as to provide tracking information for user input.

Other uses of snap action limit switches include control switches and overload switches. Control switches are typically used in automated processes to control the flow of materials and are often used to detect material level, measure speed, and trigger start-stop operations. Overload switches, on the other hand, are designed to trip when an electrical overload is detected and are typically used to protect motors from overloading. In addition, snap action limit switches are used in medical devices and home appliances, such as dishwashers and clothes dryers.

The working principle of snap action, limit switches is based on the mechanical tension of a spring. When the switch is activated by an external force, the armature moves down and the tension of the spring is released. This causes the electrical contact to open or close, depending on the design of the switch. The visible movement of the switch is referred to as the "throw" and is usually measured in degrees. The typical range of the switch is from 30 to 90 degrees.

Snap action limit switches are used in many different applications, from the operation of electronic equipment, to controlling the flow of fluids and materials, to providing feedback on the position of switches and components in a mechanical system. They are durable, reliable, and long-lasting, and their design allows for a wide range of applications in almost any area where an electrical circuit needs to be opened or closed.

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