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Snap Action, Limit Switches

A snap action, limit switch is an electromechanical device that is used to turn an electrical circuit on or off when an external force is applied. It is typically used to detect the presence of an object, to detect the presence of an object and its motion, or to detect the presence of an object and its speed.

Conventionally, a snap action limit switch consists of a switch body with fixed contacts (usually a “C” terminal), a movable arm, spring and plunger which closes a contact when a movement occurs. When the plunger is moved, it causes the spring to compress, which forces the movable arm to close the contact, thereby completing the circuit.

Functionality

Snap action limit switches are used in a wide range of industries and applications. Generally, these switches are used for forward or reverse limit detection or for counting purposes in automated assembly line or other applications. Additionally, they are used for pulse width modulation applications and for controlling lift and opening/closing functions of doors and windows.

The most common application for a snap action limit switch is detecting the presence of an object or detecting the motion of an object, such as a vehicle or machine part. It can also be used to detect the speed of an object or to control the speed of an object or system.

Advantages of Snap Action Limit Switches

One of the major advantages of snap action limit switches is their reliability and robustness. These switches are extremely durable and are less prone to wear, tear and malfunction even after prolonged use. They are not vulnerable to dust, moisture and other environmental elements, making them ideal for industrial use.

Snap action limit switches are also quite cost-effective which makes them a popular choice for low-cost applications. They are easy to install and maintain, making them a great choice for maintenance teams. Compared to other types of limit switches, snap action limit switches are often more affordable, easier to use and more accurate.

Types of Snap Action Limit Switches

Snap action limit switches are available in a variety of configurations and styles. Some types have a fixed contact and a free momentary contact while others have additional contacts to sense and/or detect various states, such as whether the switch is in the open or closed position. Other types have sealed housings, different contact materials and/or added temperature ratings to allow them to function in extreme temperatures and environments.

The most common type of snap action limit switches are SPST (single pole single throw) and SPDT (single pole double throw) switches, which are commonly used for on/off operations and for switching between two sets of contacts. These types of limit switches are commonly used in industrial machines and applications, such as medical equipment, machine tools, and door openers, among others.

Conclusion

83160092 snap action limit switches are an efficient and reliable type of switch that can be used in a wide range of applications, from forward or reverse limit detection to pulse width modulation and temperature measurement. They are available in a variety of configurations and styles to suit different purposes, and are relatively cost-effective, easy to install and maintain, making them a popular choice.

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