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Why in NSX (Thermal Magnetic) , the fixed short circuit protection is up to 160Amp range while the adjustable short circuit protection is for ranges more than 160Amp? Is there any logic behind that?

We cannot afford a delay in short circuit for small ratings. For small ratings, they have to be instantaneous. This would make it better for:

1. The installation and equipment.
2. Discrimination, the smaller ratings need to be instantaneous and the upstream can have a small delay
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