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Snap-action, limit switches are mechanical devices which are used in various applications and are driven by an external force. These switches are used where precise action is required, such as providing feedback to an operator or controlling an electrical circuit.

Types of Snap Action, Limit switches

The two main types of snap-action, limit switches are normally open switches and normally closed switches. A normally open switch has a contact that is open until the switch is actuated. This type of switch is often used in applications where an un-powered control system is used to control an electrical circuit.

A normally closed switch has a contact that is held closed until the switch is actuated. This type of switch is often used when the switch must be manually or automatically reset to the mapped position upon completion of the action.

Applications of Snap Action, Limit switches

Snap action, limit switches have a wide range of applications, including the following:

• Industrial machine control
• HVAC control systems
• Medical equipment
• Security systems
• Operation panel assembly
• Robotics
• Military applications

The most common applications for snap action, limit switches include:

• Motor speed monitoring
• Position sensing
• Limit detection
• Overhead door closure
• Door locking systems
• Fire alarm systems
• Automatic window opening and closing

Working Principle of Snap Action, Limit switches

Snap action, limit switches are mechanical devices that are activated when an external force or motion is applied. The external force or motion causes the switch to move from an open to a closed position, completing an electrical circuit. This action is referred to as snapping because the switch moves in a rapid, snapping motion.

When an external force or motion is applied, the switch blades are forced together, closing the contacts and completing the circuit. When the external force is removed, the blades snap back open, breaking the circuit.

The snap action on a limit switch is achieved through the use of a spring-loaded mechanism. The spring-loaded mechanism is designed to be highly sensitive, and it allows the switch to move from an open to a closed position with very little force. The sensitivity of the switch allows it to be used in a wide variety of applications, from industrial machines to robotic arms to home appliances.

Conclusion

Snap action, limit switches are versatile, reliable devices that are used in a wide variety of applications. They offer precise action control in applications where an un-powered control system is used to control an electrical circuit. The working principle of these switches is based on the use of a spring-loaded mechanism, which allows them to be highly sensitive to external forces or motions.