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A snap action, limit switch is a type of electrical switching mechanism that controls a device by using mechanical force or temperature to activate or deactivate a circuit. It is an ingenious way to control the power supply of an electrical device, or to disconnect it from the power grid when necessary. The switch must be able to differentiate between a break in the circuit or an overload condition.The design of the snap action switch involves customized components that are tailored to the particular application. An important feature of a limit switch is its capacity to sense thermal overloads before they can cause permanent damage. This is achieved by the aluminum arc covers that contain the contacts.The snap action switch works in a number of ways. A force or temperature activate the switch which causes it to move and open or close the electrical contact. The current flow through the contact then reactivates the switch once the switch attains a certain temperature. An arc produced by the switching action heats the air in the enclosure causing the switch to reset itself. The contacts can be made from a number of materials including gold, silver, brass, bronze, and stainless steel. The contacts can also be formed into a variety of shapes such as oval, round, rectangular, or square. The material choice and shape of the contact are specific to the application and environment in which the switch will be used.The construction of a snap action limit switch is quite simple and they are rugged in design. The contacts are protected by an electrical arc that is produced when the contacts are open. The current is then shut off when the contact is opened preventing it from reaching a dangerous voltage or temperature. The switches can be constructed with a variety of contact configurations such as single pole, double pole, normally open and normally closed contacts. The contact can also be configured for a specific voltage or power requirement.The application of a snap action switch depends on its contact setting. A latching type switch can be used to control an appliance such as a lamp, fan, or even an entire home. A timed switch can be used to control the start and stop times for a specific task. The power to tool motors, motor starters, and motor controllers can be controlled with a switch as well.The different components that make up a snap action limit switch each serve a specific purpose. The switch is designed to turn the current on or off in response to an increase or decrease in temperature or other external force. A protective casing made of hardened steel protects the contacts of the switch. The aluminum arc covers prevent arcing and protect the contacts when they are open or closed. The materials used in the manufacture of the switch are tailored to the application. Careful consideration must be given to the voltage and power requirements of the application. The contacts must be constructed of materials that can withstand the electrical load and environment in which the switch will be used. Snap action, limit switches are extremely useful in a variety of applications. Their simple construction, reliability and ability to detect temperature or force make them the preferred choice for controlling electrical power. The precise, switches are designed to open or close a circuit with a snap action when activated. The electrical arcs that are produced when the switch is opened or closed are contained in protective cases making the switches safe to use and reliable.

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