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Snap Action, Limit Switches - Application Field and Working Principle

Snap action, limit switches are widely used for a variety of applications due to their reliable performance and robust construction. They are most commonly used in industrial settings but can also be used for general purpose applications in the home and other leisure settings. They can help to sort components, activate solenoids, change motor speed or control lighting.

The most popular type of limit switch is the key type switch. This type of switch uses a flat wired rod that is inserted into the keyhole of a lever. When this rod is pushed to the side, it snaps back into its original position when released. This action closes the electrical circuit and completes the operation.

Another type of switch commonly used is the ON-OFF switch. These switches have a momentary contact which turns on a system when a button is pressed and then turns it off when released. This is ideal for starting and stopping motors, controlling electrical systems and more.

Another type of switch commonly used is the timed switch. These switches have time delays that allow for the power to be turned on for a specific period of time. This is commonly used for applications where the power needs to be on for a certain amount of time before it is switched off.

The most prominent option when it comes to operating limit switches is the rotary switch. This switch is a mechanical switch that uses a rotating arm or cam to turn the system on and off. This is beneficial for controlling electrical motors and other larger systems.

Limit switches are also used in a variety of other applications such as controlling hoists, regulating pressure, and controlling other systems outside of the electrical system. Many of these applications allow for the switch to be operated in both manual and automatic modes.

The working principle of limit switches is based on the contact, or separation, of electrical contacts on a fixed arc. When the limit switch contacts are in contact with each other, it signals either an opening or closing the circuit. It is then up to the user to decide what is to happen when the limit switch is activated.

The contact break and make times of limit switches can determine its application. For example, a high contact break time like 100 ms would mean that the switch is suitable for air-gap applications, such as safety circuits. If a low contact make time is required, like 10 ms, it would mean that the switch is suitable for faster applications, such as overload prevention.

The application field for limit switches is vast. From simple doorbells to complex medical equipment, limit switches are used for everything from controlling lighting systems to regulating steam pressure.

Limit switches are used in settings where repeatability and accuracy must remain consistent. This type of switch enables users to control the needed force and pressure to activate the switch. Whether used in industrial, consumer or medical settings, limit switches provide users with reliable results every time.

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