Important Terms and Definitions related to Motor Control and Protection
Below are the basic and important terms related to Three phase motor control and protection and you must know for understanding and reading the control diagrams of three phase motors. There are lots of terms but we will define the most important and related to the topic.
Following are the important terms related to Motor Control and Protection
A contactor, in which the main contacts close and open through electromagnetic effect.
This is a contactor in which force provides for opening or closing the main contact through the electrically operated pneumatic device.
Current flows from supply to the load through main circuit. This circuit is designed for closing or opening the conducting parts of the contactor.
When a Contactor is in Close position, then main contacts in the main circuit are responsible to carry the load current
That circuit which is designed for the closing or opening operation of the contactor. This circuit is electrically energized or de-energized normally.
As the name indicates, this is another circuit except main and control circuit i.e. auxiliary circuit.
That Control Contact, which closes when main contact closes.
That Control Contact, which opens when main contact closes.