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Snap action switches, also generally known as limit switches, are small electromagnetic devices used to control power circuits. They are designed to open and close electrical contacts when a certain amount of mechanical pressure or force has been applied. This type of switch is most commonly used in applications in which it is necessary to activate a device when a certain amount of force is applied.

Limit switches can be used to control and monitor power circuits, to indicate the presence of objects, and in some cases, to control the speed of motors. They are commonly used in the automotive industry for applications such as engine control, power window operation, and safety light activation.

The working principle of a snap action switch is based on the mechanical interaction between two components called the contact and actuator. The contact is typically a thin metal strip, which is mounted to one side of the switch. The actuator is a protrusion, usually made from a metal rod, which then passes through a hole at the other end of the switch.

When an external force, such as the movement of a lever, is applied to the actuator, it pushes the contact down, resulting in a break or contact in the circuit. Conversely, when the external force is removed, the contact then moves back up, and the circuit is closed. The amount of force needed for this to occur is referred to as the activation force, and it depends on the design of the switch.

There are two types of snap action switches: normally open (NO) and normally closed (NC). NO switches are typically open in their rest position, and they are usually used to detect the presence of an object, while NC switches are normally closed in their rest position, and they are typically used to control or turn off power. In both cases, a certain amount of force is needed to activate the switch.

Snap action switches are found in many different applications and industries, ranging from machine tools and industrial process automation to doorbells and electronic toys. They are also used in many different fields, such as robotics and medical devices.

In short, snap action switches, also known as limit switches, are small devices used to control circuits with the aid of a mechanical force. They are most commonly used in the automotive industry and in many other fields, and they come in two varieties: NO and NC.

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