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High current fuses and holders

John Mann
Hello All,

A drive manufacturer has specified that a 450A 1kV fuse should be used on the DC bus supplying its drives.  I've only located one fuse that meets this spec, the Siemens 3NE3233 (RS 395-822). This is a size NH2 fuse, and NH2 fuseholders don't seem to go above a 400A rating e.g. the Bussmann TD2-D (RS 765-2960).

It would concern me to put a 450A fuse in a 400A-rated holder, however the current in normal operation will be about 300A and in a fuse-blow situation, well above 450A.  Would I be justified in using this part, or can anyone point me to alternative holders (or fuses)?

Thanks,

John.
  • Former Community Member
    0 Former Community Member
    Hello,


    Try giving SIBA a call. In the past, they always managed to have fuses & holders to suit my drive applications.


    Regards,


    Jon
  • 0
    John,

    You could also talk to the drive manufacturer to see what they would suggest. If they have specified a particular rating they must have knowledge about a fuse that meets what they want.

    Alasdair
  • Former Community Member
    0 Former Community Member
    Hi John,

    Have a look at the Siemens catalogue here:
    https://cache.industry.siemens.com/dl/files/641/109750641/att_959097/v1/LV10_042018_Chap05_EN_web_201808061239543289.pdf

    If you need anything further speak to Siemens directly, I have always found them very helpful.
  • 0
    Thanks to everyone who replied on this. 

    Alasdair - I agree the drive manufacturer would be the obvious place to ask, but they are very slow to reply and when they do, it doesn't always address the original question! I had decided it would be quicker to find things out myself.

    Paul - Thanks for the Siemens info.  There was just so much Siemens stuff online that I didn't know where to start.

    Jon - Siba look good so I will also follow up with them.

    Thanks all,

    John.

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