Fuse Equivalents

[apprentice87]

Hi All,

From my post about the welder nameplates, you can see that the one maker recommends a T40A fuse. What the heck is that??????

I have tried looking, and it is apparently a "fast acting" one. This is quite the opposite to what conventional thinking would thing would be suitable for a 400A welding set.

I found a curve for the type of fuse here; http://www.cooperindustries.com/content/dam/public/bussmann/Electrical/Resources/product-datasheets-b/Bus_Ele_DS_1029_JJS.pdf

From what i can see of the curve, the things are even more touchy than a "B" curve MCB [unless i have misunderstood the graph]

Does anyone know what the MCB equivalent to one of these fuses would be??

Has anyone any experiences of welders on "B" curve breakers?? Conventional thinking would have you fitting a "C" or even a "D" so long as Zs was low enough. but i have never had any problems with one on a "B". have i just been lucky??

Anyway, how do they get away with using a "fast acting" fuse... Why does this not simply blow due to the inrush current. As i say, looking at the chart they are even more touchy than a "B" curve....

john..

 

[kerching]

I was under the impression that the T meant Time Delay and F meant Fast acting!...well it does on the little glass jobbies

 

[steptoe]

there is NO MCB equivalent to ANY type of fuse

fuses are far superior to the technology available in mcbs at this present time, 

 

[Sidewinder]

T is a time delayed fuse.

Typically a gM type, rather than the normal gG type.

C or D curve breaker.

However, a gM will give you a potential for a higher EFLI, for the same CCC.

there is NO MCB equivalent to ANY type of fuse

fuses are far superior to the technology available in mcbs at this present time, 

Yes Steps, but not if idiots replace them with wire links, multiple wraps of 2,5mm sq copper etc.

 

[OnOff]

 

[apprentice87]

Ahhhh.... Thanks all.

I just entered what it said on the nameplate T40A and the only thing i could come up with was this; http://www.newegg.com/Product/Product.aspx?Item=9SIA0601W03773&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-_-Home%20Electronics%20Accessories-_-Cooper%20Publishing%20Group-_-9SIA0601W03773&cm_sp=&AID=10440897&PID=4226242&SID=

I know it is an american standard, but it was the only T40A i could find. [How dull am i.....]

john..

 

[Sidewinder]

Think about something like this:

http://uk.rs-online.com/web/p/bolted-tag-fuses/0415200/

Datasheet can be accessed from there.

Remember, that the wholesaler price will be well below that, Total should have the like in stick in Newport.