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Snap Action, Limit Switches:

A snap action, limit switches are electromechanical devices which are used to control virtually any mechanical operation in an application. They are designed to detect the presence or absence of an object and then to actuate or de-actuate a switch or other mechanical object accordingly. A limit switch is typically designed to be mounted on or near an object or structure which when moved causes the switch to be opened or closed. When an object is moved into or out of the limits of the switch, the switch will sense the change and actuate the mechanism. Depending on the type of limit switch chosen, a wide variety of switch action triggers can be used.

There are a variety of types of limit switches available including, but not limited to, inductive proximity, magnetic reed switch, and roller actuator styles. Each type has its own benefits and limitations. The most common type of limit switch is the mechanical, or roller actuator style. This type of limit switch uses a metal roller which is mounted on an armature and is connected to a contactor mount. As the armature rotates, it causes the roller to roll against a contactor and opens or closes the switch depending on the direction of the armature movement. The roller actuator style is considered to be the simplest, most reliable, and least expensive option in terms of limit switches.

Beyond the roller actuator type, there are multiple different types of limit switches available. An inductive proximity switch uses a coil winding configuration to detect the presence of an object. The coil winding is placed around the object, and when a small electrical current is passed through it, it will generate a magnetic field. If an object is detected in the proximity of the switching coil, it will cause a change in the magnetic field and actuate the switch.

Another popular type of limit switch is the magnetic reed switch. This switch uses a small magnet which is positioned so that when an object moves within the proximity of the switch, the magnet will actuate the switch. A magnetic reed switch is much more sensitive than other types of limit switches and is usually used in applications where a small gap must be detected. The main advantage of using a magnetic reed switch is that it can detect very small distances and will remain reliable over a wide range of temperatures and environmental conditions.

The selection of the most suitable type of limit switch for an application relies on the specific requirements and conditions of the application. Factors such as size, voltage, and temperature range should be considered when selecting the appropriate type of limit switch. As an example, when selecting a limit switch for an outdoor application, a suitable magnetic reed switch should be chosen as its corrosion-resistant design can protect it from the elements and help it to last longer.

No matter the application, limit switches can be a great choice for providing accurate detection of an object’s position. Whether it’s controlling the motion of a mechanical device or providing valuable feedback on a machine’s operation, limit switches are a cost-effective and reliable choice.

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