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Snap Action switches, or snap action limit switches, are an essential component in many electrical and electronic devices. A snap action limit switch features an actuator, or spring-loaded contact arm, which rapidly snaps back into a different position when a predefined pressure is exceeded. The switches are characterized by their fast repetitive accuracy in opening and closing contacts. In addition, they\'re designed to break contact before making contact, providing added safety.

Snap action switches are used in a variety of applications. They\'re used in many industrial and commercial settings, such as in medical equipment, automotive systems, and computers. They\'re designed to be used in a variety of environments, including wet, dry, and corrosive atmospheres. In addition, they\'re designed to withstand extreme temperatures, high vibration, and diverse mechanical stresses.

The most common type of snap action switch is the mechanical switch. A mechanical snap action switch consists of a plunger and spring-loaded contact arm. When pressure is applied on the plunger, it moves slightly and causes the arm to snap back, making or breaking the contact. This snap back action is what gives the switch its name and its rapid response time. The mechanical snap action switches are ideal for use in hazardous locations, as well as in harsh environments where dust or debris may cause contact issues.

The next type of snap action switch is the electrical switch. In an electrical switch, a resistor is placed between the set of contacts. When the plunger pushes the switch, the resistor is quickly bypassed, allowing the circuit to be completed and either make or break contact. This type of switch is used when extremely high current loads need to be switched rapidly.

Finally, there is the contactless switch. This type of switch uses magnetism to actuate the contact arm. It consists of a receiver and a magnetic source. When the source is placed near the receiver, either making or breaking the contact, it causes a change in the magnetic field, activating the contact arm and either making or breaking the connection. This type of switch is commonly used in motion control systems and is particularly useful when a switch\'s environment is hazardous or measures must be taken to block out dust or debris.

All these snap action switches have the same operating principle: when a pressure above a given threshold is applied on the plunger actuator, the contact arm rapidly snaps back into position. This is why they\'re often referred to as snap action switches – they quickly respond to the externally applied pressure and switch contact accordingly. Depending on the application, the snap action switch\'s design and working principle may differ, but the final action is always the same: make or break contact.

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