Adrian Caspersz wrote:

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I recently keep coming across brand new unsold equipment which has been
supplied with a fast blow mains fuse that has blown at turn on.

This is from more than one manufacturer.

I have no idea what that is all about.


Second customer returns after a returned "repair" done with the wrong fuse?

If that's true, you would do well to investigate who is actually doing
this.


** Factory techs working in places like Mexico and China, sometimes elsewhere.


What class of equipment?


** Anything that has a significant inrush surge.

Toroidal transformer based PSUs are major culprits.




.... Phil