Limit switches have the main goal - switching electrical circuits in the alarm system, in control processes and control devices, where the object is checked for mobility. In systems, devices, structures where movement control of individual elements is necessary, a limit switch is usually installed. The principle of operation of such a device is as follows:
- The device is triggered by contact with the limiter, while the power supply to the mechanism in which this device is installed is interrupted. Regardless of the connection method and 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.
- Upon contact with movable mechanisms in the device of the limit switch, a danger signal is generated simultaneously with the impact on the electrical circuit. Limit switches are a common sensor with a self-switching system - a circuit breaker.
Benefits
Limit switches possess not only reliable operation and high protective properties, but also are produced in various models, which expands the scope of their application. Important is their ease of use during the operation phase. At the same time, the installation of switches does not require special difficulties in performing the work, and is possible for any electrician.
Limit switch structure
Despite the large number of brands and types of circuit breakers, all of them have high durability of the case, which is created from aluminum-silicon alloy, which allows the device to:
- be invulnerable to the chemical environment, saline solutions, fumes and other destructive effects from the outside;
- the housing is corrosion resistant, which extends the life of the device.
The switch sensors are made of bright-colored LEDs that allow you to see the operation of the sensor. Connection to power is made by connecting the connector to the electrical circuit. The device is based on two types of contacts - open and closed. In this case, closed contacts control the correct
connection of the circuit breaker, and open contacts conduct the signal after the circuit breaker is activated.
Despite the model and manufacturer, such parts remain unchanged in the structure: the housing cover, the housing itself, the head and contacts.
Application
The limit switch is used in areas where there is a high probability of danger to human life or damage to the production process, destruction, etc. Its small size allows you to use the switch in small-sized technologies. Limit switches are widely used in the field of the oil refining industry and the sphere of oil production and transportation, in chemical plants, factories, production shops in metallurgy, mining, engineering, energy, food and other fields.