fuse holder

[giguana]

how can I make or where can I buy a high-power fuse holder good for electric bikes?

I have just assembled a 406 xlyte motor and it's fantastic fun. however I put a 25a fuse in, and it melted after 20 minutes and kind of melted a little notch on the sla battery cover- I made a makeshift fuse holder wrapped in electrical tape thinking just the fuse wire gets hot but actually the whole fuse can melt things around it.

 

[jha07]

They sell fuse holders at ebikes.ca
http://www.ebikes.ca/store/photos/FuseHolder.jpg

Just curious, what controller are you running? Did the fuse blow, or just melt everything around it?

 

[giguana]

thanks, actually I just made an order from them, because the axle thread from the brand-new crystalite motor ground flat when I gave a little tug on the nut so I have to use 2 nuts on either side-highly recommended on xlyte motor.

the controller is 20a, the fuse was wrapped in copper wire around either cap and held together with electrical tape, the electrical tape was melted into a chunk, bubbling at one end, and there is a round notch 2 mm deep on the corner of one of the batteries...I only thought the centre of the fuse would melt.

 

[giguana]

I just have glass fuses, I don't know what a fast blow fuse is or what I should use with a bike...

 

[Ian]

Automotive in-line fuse holders are available from good car accessory shops or Maplins (stock code MX15R or KK80B). They normally come with 2 short lengths of heavy cable attached and take the blade type fuses that come in various ratings.

The problem with 1.25" glass fuses in the higher ratings is that the fuse holder(if used!) will often have a lower rating than than the fuse itself meaning that the fuse holder will overheat well before the fuse blows. In this case the chances are that a less than perfect connection with the fuse caps caused the overheating.

A fast-blow fuse is exactly that, it will blow quickly in the event of an overload as opposed to a slow blow fuse that will tolerate higher currents for a very brief period.

It's worth mentioning that all fuses require a rather heavier current than their nominal rating to actually blow them, typically a glass fuse will blow quickly at about 140% of it's nominal rating.

 

[giguana]

I just installed another glass fuse in a customised UK wall plug which is made of thermoplastic until I get hold of a blade one, somehow I got hold of some seriously cheap glass ones that have a fuse wire about 0.5mm which must really have some strange resistance properties. probably the car ones with a broad fuse wire are much better.