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Snap action limit switches are used in a variety of applications spanning a wide range of industries. Their primary purpose is to detect the position or movement of an item and then trigger an on/off switch, sending an output (voltage or current) to a control system. They are usually used in automation applications and industrial machinery.

Typically, snap action limit switches are designed to detect the position or movement of an item that comes into contact with a moving part or a set position that the item must reach before the switch is triggered. When this fixed position is reached, it causes a connection between the contacts installed inside the switch, which completes a circuit and sends power to the control system.

The main components of a snap action limit switch are a movable actuator and several contact points. When the item that needs to be monitored reaches the desired position, the moving part will snap into place, causing the contacts to come together and complete the circuit. There are a variety of different designs of limit switches and actuators, such as those with a roller lever, a plunger, a rotating cam and a spring.

The most common type of snap action limit switch is the SPST (single-pole-single-throw) type. This type of switch consists of a single normally open contact and a single normally closed contact. When the item that needs to be monitored reaches the desired position, the moving part snaps into place and the contacts close, completing the circuit. This causes the switch to suddenly turn on, allowing power to flow to the control system.

Another type of limit switch is the SPTT (single-pole-triple-throw) switch. This type of switch is similar to the SPST switch, however it has two sets of contacts instead of one. When the item that needs to be monitored reaches the desired position, the moving part snaps into place and one set of contacts closes, completing the circuit and sending a signal to the control system. At the same time, the second set of contacts opens, interrupting the circuit and stopping the flow of power.

Limit switches can be used for a variety of different applications such as controlling the speed of a conveyor belt, limiting the maximum speed of a motor and monitoring the level of liquid in a tank. Snap action limit switches are also commonly used in security systems as they can detect intruders and send a signal to the control system.

Overall, snap action limit switches are an incredibly useful and versatile tool for any industry. They are durable, reliable and can be used in a variety of applications. With the right design and installation, these switches can provide accurate and reliable results for many years to come.

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