question

@jonofe

That is probably because the torque is 10nm at least on the fuse side. I usually do 10/12nm both sides. Depends on the feel.

[Edit: I did see the 14nm reference]

Are you sure you have not twisted the bolt in the plastic housing at the bottom?

An face the fuses the other way so the window shows you if they are blown or not.

10 Nm is only for the nut below the fuse. The top nut should be 14 Nm.

What do you mean with twisted the bolt? I did not open the plastic housing below, because the Distributor has all bolds in place.

I checked it again and finally I saw, that one side of the fuse was completely teared, so its really broken. It seems that also the cable lug is moving, when fastening the nut with 14 Nm and the cable forwards the presure to the fuse. So I don't know what going wrong here. How can I check, wether I have original victron fuses?

Summary: I have still no idea how to avoid damaging the fuse if I don't reduce the torque.

Any hint, where to buy mega fuses in Germany which have good quality?

I’ve used the Littelfuse‘s and torqued to 14Nm on a distro no issues I do make sure to holed the cable when I’m actually torquing it down though So the cable does not move.

Correct mechanical practice where a lock or retaining nut is torqued to a higher value than the nut below is to use a second spanner on the lower nut. This is better than holding the cable, which would place a strain on the crimp.

What type of torque wrench did you use? Click type? If click type, did you stop right when it clicked?

What is the torque range?

This could happen if there is a burr on a washer causing the washers to lock and putting the twisting action on the lug and in turn on the fuse causing it to move.

Are the washers new or have they been used?

The washer were brand new and came with the distributor.

Meanwhile I ordered other Megafuses (same specs) and 5€ instead of 30€ and there is no problem at all. They are much more massive and seems they can resist the torque power.

I uses a Click torque wrench (scale 8 - 25 Nm) and set it a bit below 14Nm. And yes, the lug is moving and subsequently the fuse as well, but I already tried to hold the cable.

My only concern now is the quality of the new mega fuses. How can it be, that there is a difference of 500% in price (5€ vs. 30€)? At least from stability perspective, the cheaper ones are better. :)

@jonofe the fuse sounds questionable for a 58volt mega fuse, only fuses I know that are that cheap are the Littelfuse but they are rated upto 70volts if it is the littelfuse don’t worry it’s all good and they don’t seem to have inherited the absorbent fees of the Mega!