Limit switches have the main purpose - switching electrical circuits in signaling, in control processes and control devices, where the object is checked for mobility. In systems, devices, structures where it is necessary to control the movement of individual elements, as a rule, a limit switch is installed. The principle of operation of such a device is as follows:
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Limit switches The device is activated upon contact with the limiter, and the electricity supply to the mechanism in which this device is installed is cut off. Regardless of the connection method and the configuration of the contacts, the end elements are reliable and guaranteed to cope with the tasks. That is why the design is installed in hazardous areas.
- When in contact with moving mechanisms in the limit switch device, a danger signal is generated simultaneously with the impact on the electrical circuit. Limit switches are an ordinary sensor with a self-shutdown system - an automatic switch.
Benefits
Limit switches not only have reliable operation and high protective properties, but are also produced in a different model range, which expands the scope of their application. Their ease of use during the operation phase is important. At the same time, the installation of switches does not require any special difficulties in performing work and is within the power of any electrician.
The structure of the limit switch
Despite the large number of brands and types of switches, they all have a high strength case, which is created from an aluminum-silicon alloy, which makes it possible for the device to:
- be invulnerable to the chemical environment, saline solutions, fumes and other damaging effects from the outside;
- corrosion-resistant housing, which prolongs the life of the device.
Switch sensors are made of brightly colored LEDs that allow you to see the sensor operation. Power connection is made by connecting the connector to the electrical circuit. At the heart of the device there are two types of contacts - open and closed. At the same time, closed contacts control the correct connection of the switch, and open contacts conduct a signal after the switch is triggered.
Despite the model and manufacturer, the following parts remain unchanged in the structure: case cover, case itself, head and contacts.
Application
The limit switch is used in areas wherethere is a high probability of danger to human life or damage to the production process, destruction, etc. Its small dimensions allow the switch to be used in small-sized technologies. Limit switches are widely used in the oil refining industry and in the field of oil production and transportation, in chemical plants, factories, production shops in metallurgy, mining, engineering, energy, food industry and other areas.
