[LS contactor, MC 50a, 220 coil Volt](https://www.automation24.ir/product-1104/%DA%A9%D9%86%D8%AA%D8%A7%DA%A9%D8%AA%D9%88%D8%B1- l s-%D9%85%D8%AF%D9%84-mc-50a-%D8%A8%D9%88%D 8%A8%DB%8C%D9%86-220-%D9%88%D9%84%D8%AA)
Contactor:
Contactors are electromagnetic switches and are considered to be one of the most important components of control circuits. Before contactors were made, connections were made by manual switches, which were of different types of blades, tongues and rollers, but with the arrival of contactors in the market, almost all the uses of simple switches Out of class, contactors were considered faster and more reliable.
## Compared to simple keys, the contactor has characteristics such as:
1. Command from several points
2. Remote control
3. Being economical
4. Automatic shutdown in case of power failure
5. The possibility of designing automatic circuits
### contactor building:
It can be said simply that the contactors are a series of metal contacts that are insulated from each other and also made of a bobbin to attract and repel these contacts.
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### Principles of contactor work:
When the fixed bobbin is electrified by the control key, it acquires magnetic properties and attracts the moving part of the core like a magnet, since there are contacts in the attraction area that are in charge of turning off and on the electricity, when The attraction of the two cores of these contacts is connected and the contactor is connected.
There are springs between the two cores. The application of these springs is when the contactor is disconnected, so that when the coil is not fed by the control circuit, the electricity is cut off and the spring separates the two cores from each other.
## Some important specifications listed on the contactor plate:
1. Rated working voltage (ue): It is the voltage that the contacts can withstand with the rated current Ie.
2. Nominal insulation voltage (ui): specifies the insulation strength between connecting members.
3. Nominal supply voltage (uc): It is the amount of voltage that must be given to the contactor coil to trigger the contactor, and its value is usually written on the contactor.
4. Rated working current (Ie): The rated working current of a contactor is a current that expresses the condition of using the contactor and is related to the type and amount of voltage.
## Items that must be observed when buying a contactor:
1. Coil supply voltage
2. Performance flow
3. Contactor power
4. Peripheral equipment
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| Country | Iran |
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