contactor or fuse position in circuit rules - WHY??

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Ampy
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Joined: 03/27/2014
Points: 52

Manuals advise contactors and fuses to be put on the B+ end of the circuit not the B-
Why does it make any difference, the whole lot is connected in series so I can't see how in physics it matters
Theres obviously something about electronics I don't understand, grateful if someone can explain?

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Ampy
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Joined: 03/27/2014
Points: 52
Re: contactor or fuse position in circuit rules - WHY??

This is the question thread if anyone can help, maybe mod can remove the other one which was double post

Johnny J
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Joined: 07/08/2008
Points: 377
Re: contactor or fuse position in circuit rules - WHY??

As you say it really doesn't matter, but when it comes to vechicles minus earth (ground) has been the standard for a long time and therefore it's easier to put fuses and such on the plus wires.

MEroller
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Joined: 09/26/2011
Points: 837
Re: contactor or fuse position in circuit rules - WHY??

Though of course a high-voltage traction battery should have no business at all with ANY pole connected to the vehicle frame/body! Traction batteries should be completely isolated within the vehicle for obvious safety reasons.
But as Johnny J wrote, that does not stop electric vehicle manufacturers from placing fuses and the likes on the positve pole of the traction battery, just out of good old familiarity...

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