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What is the substitution for C500?

The C500 is very old and obsolete (early 1970's), and it cannot be replaced exactly in the same place with the NSX range. 
You will need to completely change the Plugin base + MCCB and replace with a new set from NSX range (+ the busbar alignment in the switchboard). 

The dimensions of the NSX 3P 400-630A frame is (W140xH255xD110). 

Since we have a lot of new features added in the NSX range, like trip units with advanced features, and communication facility, you can check the NSX Catalogue to choose any of the new features if required.
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