It is an electromagnetic mechanical switching device used in the power circuit to switch on and switch off the power to the electrical machine.
i.e.
a switch that is operated by an electromagnetic phenomenon.
To put it simply
Normal piano key switch installed in your room switches on the supply when you press it from bottom half and switches off when you press it from the top half.
An electromagnetic mechanical switch operates when you supply electricity to it and switches off when the electrical supply stops .
How a contactor actually works :
A contactor consists of a coil which when charged attracts a core downwards which is mechanically connected to three mutually insulated strips that makes or break the 3 power contacts of the contactor.
In addition to the power contacts contactors may also have auxiliary NO and NC contacts
that operate along with the contactor power contacts i.e. they are mechanically coupled to the power contacts of the contactor.
the auxiliary contacts are used in the control circuit of the contactor for various applications.
the contactors are differentiated according to the rated voltage of the contactor coil .
it can be
- 24V DC
- 24V AC 50/60Hz
- 110V DC
- 110V AC 50/60Hz
- 220V AC 50/60Hz
Complete imagery of a dismantled contactor.
This is not the standard construction of a power contactor that all manufacturers follow,
different manufacturers have there own unique i.e.
"patented" way of making a contactor.
but the basic components remains the same.
Very Detailed Explanation given about Electrical Contactor, very useful information shared.
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