VFD Panel : Protective Switchgears

In my Previous post I just have mentioned the basics fundemental facts regarding AC Drive panel
In this article is shall discuss

• the various protective switchgear available 
• what all configuration we can opt
• how to choose protective switchgear

Isolation
Mainly in almost all industries there will be a MCC panel for various motors installed. When separate drive panel to be provided a power isolation to be included in the panel
mainly we have following options

• SDF
• ISOLATOR
• MCCB
• Power contactor

 Now Using SDF is convention practice, but now a days customers prefer MCCB to SDF. While ordering MCCB should also order the door mounting kit if you want to operate the device from door.

Now is the incomer supply needs to be controlled remotely then we use Powercontactor and it is switched by proper control loop.


Semiconductor Fuse

For Power Electronics based switching devices it is always good to include
thyristor fuse at the incomer. Now when compared to HRC fuses, thyristor fuses are much more costlier.

while ordering fuse, you have to be careful in selecting fuse and its base.different type of fuses are available in the market.

most of the manufactures in their vfd catalogue have mentioned the details of
appropriate switchgear to be used along with particular drive. once you get the specification you can opt for different make if price does matter

I shall include some selection chart in the next post and shall explain with examples  " how to select right switchgears"