What is the difference between MCCB NSX630 - NS630b as both are 630 A nominal rated current ? | Schneider Electric Egypt and North East Africa

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What is the difference between MCCB NSX630 - NS630b as both are 630 A nominal rated current ?

For the two MCCB NSX630 and NS630b, the main differences are in the following points:

1- Frame size
2- Avilable breaking capacities
3- Electrical durability