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Snap action switches, also known as limit switches, are electromechanical controls used to control electrically powered devices such as electric motors, pumps, and HVAC systems. These switches use an actuating lever to open and close electrical contacts, allowing for precise control over the operation of electrical devices. The primary types of snap action switches are classified as either simple held-closed or held-open types, based on the action required to open or close the electrical contacts.

The snap action limit switch is the most common switch used in industrial and home applications. It is a reliable and cost effective way of controlling electrical devices, as it can provide precise switching control in a wide range of electrical, mechanical and environmental conditions.

Snap action switches are typically used to regulate the operation of electric motors, furnaces, fans, pumps and other heavy-duty equipment. They are also used to provide reliable, safe and efficient control of electric lights, water heaters and other household appliances.

A snap action limit switch uses an actuating lever to open and close the electrical contacts. This actuating lever is attached to an adjustable spring-loaded toggle switch which is tensioned with a calibrated force. This adjustable force allows for precise control over the electrical contacts.

When the toggle switch is activated, the spring-loaded lever pushes against the electrical contact, creating a breaking point. When the force from the lever exceeds the breaking point of the contact, the electrical contact is opened, allowing the electrical current to be cut off or on depending on the application.

The different types of snap action switches are further classified by their operating speed and operating mode. For example, a momentary switch is one that is held in one position for only a moment before it either opens or closes the electric circuit. This type of switch is often used as an emergency stop switch. A slow break switch is a type of snap action switch which is actuated by a slow build up of force, allowing for very accurate and precise control over the electric current.

A single pole switch can be used to control a single electrical circuit, while double pole switches are used to control two independent circuits. A double pole double throw switch is often used to control a single circuit, with two separate states (on or off). Snap action switches can also be configured as fail-safe switches, which automatically turn off the electrical current if power is disrupted.

The working principle of a snap action switch is simple. When an actuating lever is pushed against an electrical contact, the force from the lever opens or closes the contact, depending on the switch’s configuration. This allows for precise control over the on/off state of electrical devices or circuits.

Snap action switches are used in a wide variety of applications, including industrial equipment, home appliances, cars and other vehicles, medical equipment and robotic systems. They are ideal for use in applications where high levels of accuracy and reliability are needed. Snap action switches are also becoming increasingly popular in energy savings applications, as they allow for fine-tuning of electrical device operation.

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