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Is it possible to install the existing NSX630 NA 4P Trip unit to a new NSX630 4P frame.

No you can not replace the NSX630NA it is not possible to install the existing NSX630 NA 4P Trip unit to a new NSX630 4P frame. As on the existing NSX630NA 4P trip unit, the top part of fuse screw is already broken and scraped (as picture below) . Only with the new fuse screw , you can make sure the tightening torque to connect the trip unit to the breaker frame.

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