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Snap Action, Limit Switches

A snap action, limit switch, sometimes called a micro switch, is a mechanical device used on many types of automated assemblies and mechanisms. This electrical switch operates by reacting to an external force such as pressure, tension, vibration, or temperature. When the switch is triggered, it quickly snaps either open or closed. This snap action can, in turns, be used to control machines and equipment.

Applications for the snap action, limit switch are far reaching, and include switches used for elevator doors, vehicle shock absorbers and to monitor position in industrial conveyors. The switches can also be used in main power supply systems, thermostats and smoke detectors.

A snap action switch is made from an actuating arm that is spring loaded in such a way that, when contact is made, the spring will be compressed and the arm will be snapped open or closed. The actuating arm is an important part of the mechanism, since its function is to provide contact with a trigger. The trigger can be anything from a loop lever to a roller.

The actuating arm is confined within a housing, the the most common types are made from either plastic or metal. The housing is generally rectangular in shape, and contains two parts; the actuating arm and the contacts. The two contacts are connected to the triggering mechanism, and when the actuator arm is depressed, the contacts will form an electrical connection.

In order to control how quickly the switch opens or closes, it is important to use an actuating arm that is of an appropriate length. Generally, longer actuating arms will have a slower switching behavior, while shorter ones switch more quickly. This behavior is known as "rate sensitivity".

The snap action switch can be used in either a normally open or normally closed position. In a normally open position, the switch is open (or "off") until the actuating arm is triggered, at which point it will snap closed. In a normally closed position, the switch is closed (or "on") until the arm is triggered, at which point it will snap open.

The snap action switch operates using electrical currents, which can be either alternating current (AC) or direct current (DC). The type of current used will depend on the application, but AC is generally more common as it is easier to regulate. AC powered switches are designed to operate at the rated voltage and frequency, and will typically switch off at a certain percentage of this voltage.

In order to ensure the switch does not suffer from electrical damage due to excessive current, it is important to understand the rating of the device. The rating can be found on the product datasheet and will describe the maximum voltage and amperage the switch can safely handle. If the current exceeds the rated limit, the switch will be damaged and may need to be replaced.

In conclusion, the snap action, limit switch is an essential component of many pieces of machinery and automated systems. This invaluable device allows for quick and accurate control of machines, and is designed to operate in a variety of applications.