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Snap Action, Limit Switches

A snap action, limit switch, or simply limit switch, is a device used to detect the state or position of a mechanism, part, or actuating device. Snap action limit switches are designed to switch quickly and accurately and are used in a variety of applications ranging from controlling the movement of machines to controlling the operation of pumps, motors, and other fixed or automated devices.

Applications

Limit switches are used in a wide variety of applications including controlling the operation of pumps, motors, and other fixed or automated devices. Common applications for snap action limit switches include industrial processing plants, automotive manufacturing, and robotics. Furthermore, limit switches can be used to detect motion, temperature, pressure, vibration, and presence of object.

Working Principle

Snap action limit switches are designed to quickly and accurately detect the state or position of a machine, part, or actuating device. These switches operate on a principle of mechanical force. When activated by an actuator, the contacts within the switch move from their normally open or normally closed state. When this movement occurs, a mechanical force is applied to the actuator, causing a rapid click or snap action. The force of this action will vary depending on the type of switch, but typically ranges from 0.01 to 10 newtons.

Types

Snap action limit switches come in a variety of styles and construction to meet the needs of various applications. These include low voltage, high voltage, reverse action, and more. Some common types include:

• Low Voltage - These switches are designed to operate at voltages below 60 volts and are typically used in commercial, industrial, and residential applications.
• High Voltage - These switches are designed to operate at voltages above 60 volts, and are most often used in industrial and commercial applications.
• Reverse Action - These switches are designed to reverse their position when activated. This type of switch is mainly used in industrial applications.
• IP Rated - These switches are designed to be dust tight and water resistant, making them suitable for use in wet or dusty environments.

Conclusion

Snap action limit switches are useful devices for detecting the state or position of a machine, part, or actuating device. These switches are available in a variety of styles to meet the needs of various applications, from low voltage to high voltage and from reverse action to IP rated. They are reliable devices that can provide fast and accurate switching for a wide range of applications.