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Wednesday, January 19, 2022

ON VIDEO Contactor, what is it and how does it work?

 

The contactor is an electromagnetic relay which, thanks to power contacts (poles), ensures the operation of motors, resistors or other high-power receivers.

Depending on the model, it also has integrated open or closed auxiliary contacts, it is possible to add additives or auxiliary blocks used only for remote control or signaling.

Composition of a contactor
A coil.
A return spring.
From 2 to 4 power contacts or poles (unipolar, bipolar, three-pole, four-pole).
A magnetic circuit consisting of a fixed magnet and a moving magnet (fixed and moving armature).
A phase shift ring that stabilizes the vibrations of AC-powered coils.
Open or closed auxiliary contacts.


Operation of a contactor
The contactor coil (terminals A1-A2), can be supplied with alternating current or direct current (24V,48V,110V,230V,400V).
When the coil is energized, a magnetic field forms, the moving part of the armature is attracted against the fixed part and the contacts close (or open depending on the model).
When the coil is not powered, the return spring separates the two parts of the armature and keeps the power contacts open (or closed).


Main criteria for choosing a contactor
The contactor coil control voltage.
The receiver supply voltage.
Number of power contacts (1,2,3,4).
The power consumed by the receiver.
Breaking capacity, maximum current that the contactor can withstand.


 

The contactor is an electromagnetic relay which, thanks to power contacts (poles), ensures the operation of motors, resistors or other high-power receivers.

Depending on the model, it also has integrated open or closed auxiliary contacts, it is possible to add additives or auxiliary blocks used only for remote control or signaling.

Composition of a contactor
A coil.
A return spring.
From 2 to 4 power contacts or poles (unipolar, bipolar, three-pole, four-pole).
A magnetic circuit consisting of a fixed magnet and a moving magnet (fixed and moving armature).
A phase shift ring that stabilizes the vibrations of AC-powered coils.
Open or closed auxiliary contacts.


Operation of a contactor
The contactor coil (terminals A1-A2), can be supplied with alternating current or direct current (24V,48V,110V,230V,400V).
When the coil is energized, a magnetic field forms, the moving part of the armature is attracted against the fixed part and the contacts close (or open depending on the model).
When the coil is not powered, the return spring separates the two parts of the armature and keeps the power contacts open (or closed).


Main criteria for choosing a contactor
The contactor coil control voltage.
The receiver supply voltage.
Number of power contacts (1,2,3,4).
The power consumed by the receiver.
Breaking capacity, maximum current that the contactor can withstand.


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