Скачать или смотреть What is Magnetic Contactor ? How to Work it?|Function of a Contactor

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In this video I Want to Explained a bout Contactor, Operation , Function
What is Contactor ? How to Work it?|Function of a Contactor
Basically, a contactor is an electrical Switching device.
It is used for Switching an electrical Circuit ON and Off.
It is a special type of relay , but there is a basic difference between the contactor and relay.
The contactor is mostly used in applications where higher current carrying capacity is involved , while the relays are used for lower current applications.
Contactors are compact and can be field mounted easily.
Usually , these devices feature multiple contacts.
The contacts are normally open , and the provide operating power to the load whenever the contactor are popularly used with electric motors.
There are different types of Contactors , and the various types have their own sets of features , applications , and capabilities.
Contactors can make over a vast range of current , ranging from a few to thousands of amperes , and voltage from 25 volt DC to thousand of volt .
Furthermore , these devices come in various sizes , from small hand-held dimensions to large size measuring up to a meter or a yard on one size.
Contactor are most commonly used with high-current load because of their capability to handle current well over 500 amperes and high power well over 100 kilo watts.
When heavy motor current are interrupted, they produce arcs.
A contactor can be used to reduce and control these arcs.

Operation principle of a Contactor
The operating principle of the contactor is quite simple ; the current flowing through the contactor energizes the electromagnet.
The energized electromagnet then creates a magnetic field .
This cous the core of the contactor to move the armature .
The circuit is the completed between the fixed and moving contacts by a normally closed ( NC) contact allowing the current to pass through the contacts to the load.
When the current is stopped from passing through , the coil is de energized and opens the circuit.
The contactors contacts are able to rapidly open and close , which is why they are able to handle larger loads.
The current input to the contactors coil may be DC or AC ( Available in different voltage ranges between 12 volt AC or 12 volt DC to 69 volt AC or 440 volt DC).
To reduce the amount of power drained by the contactor coil during operating , economizer circuit are employed .
Contactor with AC Coils are equipped with shading coils.
Otherwise , the contactor will chatter every time the AC cross zero.
Shading coils are able to delay demagnetization of the magnetic core to avoid chatting.
DC coils do not need shading as the flux produced is always constant .
Function of a contactor
When electric current pass through the contract , it causes the electromagnet to create a strong magnetic field.
This magnetic field pulls the armature into the coil, and this creates an electrical arc.
Electrical currents flow in through one contact and into the device in which the contactor is embedded.
Therefore, the function of the contactor is to switch an electrical circuit can be prevented by adding and thermal overload relay.
To deactivate , the contactor can be pulled out of the parent device in which it’s embedded and operating .
In the absence of electric current flowing through , thus braking the connecting .

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