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Snap action, limit switches are electro-mechanical devices used primarily to monitor the position and/or movements of mechanical systems. The mechanism responds to an actuating force which moves a movable contact from a non-energized position to an energized position when a predetermined trip force is reached. Most of the contact arrangements are pre-arranged to make and break a specific electrical contact at the energized position.

One of the most common uses for a snap action, limit switch is to detect an open or closed position of a door. It\'s possible to install a limit switch on either side of the door, enabling detection of the door opening as well as its closing. When used in this manner, the limit switch is often referred to as a presence switch.

Another common application of snap action limit switches is to detect the presence or absence of a liquid level in a tank or container. The switch is attached to the outside of the tank and the contact arm extends into the tank to trigger the switch when the level of the liquid reaches or passes a certain point. This type of limit switch is also referred to as a float switch.

Snap action limit switches are also used to detect movement along a track or rail. The switch can be triggered at certain points along the track to indicate that a car, train, or other desired object has passed the point. In some instances, multiple limit switches are used along the same rail to indicate more points at which movement has taken place.

These switches are also used on treadmills, to detect how far someone has moved, or on conveyor belts, to detect when items have been moved to a certain point. Limit switches can also be used for a variety of applications such as process control, preventing overloads, and controlling motors.

Snap action, limit switches are designed to be actuated when a particular force is applied along its operating axis, causing the moving contact to pivot or jump along its surface and make or break the contact pair, depending on the direction and magnitude of the applied force.

When the limit switch is triggered, the contact (which is either normally open or normally closed) changes when the contact arm touches the actuator. The switch can be made to change state again when the contact arm is moved away from the actuator. This is known as the re-set or on switch, which is often used in safety systems.

Limit switches have several advantages, including their rugged construction, simple installation, and low cost. They are also used for their reliable and accurate operation, and the ability to be triggered from multiple directions. However, one disadvantage is that they require an external force to actuate them, making manual triggering a necessity.

Snap action, limit switches are essential components in a wide variety of applications. From monitoring the movement of mechanical systems to controlling the operation of motors, these switches offer accurate, reliable, and low-cost operation for a variety of automotive, industrial, and home applications.

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