[sdiy] Question on 120v/240v fuses and PowerOne PSU

[Tom Bugs]

Thanks Harry - clears that questions up well - that's exactly what I needed!
Cheers,
Tom

harrybissell at wowway.com wrote:
> As long as the VOLTAGE rating of the fuse exceeds the line voltage, that
> is SAFE to use.  You should use a fuse of the correct (specified) amperage
> for the line voltage.
>
> (its similar to capacitors, you can use a highewr voltage but the microfarad
> rating should be correct).
>
> Don't EVER use a lower voltage fuse (like a 12V auto fuse) fro a line voltage
> application. They are not guaranteed to clear (open) safely. The voltage might
> still arc through the fuse and cause trouble. 
>
> THIS IS DOUBLY IMPORTANT at higher voltages... a 240V fuse will NOT protect
> a 480V line...
>
> H^) harry
>
>
> On Wed, 29 Oct 2008 17:31:42 +0000, Tom Bugs wrote
>   
>> Hiya,
>>
>> Using a PowerOne HAA15 supply, the fuses are spec'd differently for 
>> 120v and 240v. -> 375mA for 240v (and 220v) and 750mA for 120v (and 
>> 100v)
>>
>> I have two bags of fuses to use (375mA and 750mA!) but I just 
>> noticed that they're both spec'd at 240v.
>>
>> For 120v should I use 240v 750mA fuses? Or do the 240v375mA fuses 
>> give 750mA at 120v??
>>
>> The reason for my confusion is that on pwr switches, for example,
>>  you usually have a spec such as 3A at 240v / 6A at 120v.. Though I 
>> just checked a bit on the 'net and it seems as though a 240v fuse 
>> should behave the same at 120v --- in which case I do use a 240v 
>> 750mA fuse.
>>
>> Any help, please let me know - thanks!
>>
>> Tom
>>
>> PS -- a note -- I just found out (by testing with a step-down 240v-
>>     
>>> 120v trafo) that if you trim-up an HAA15 for +/-15v operation at 
>>>       
>> 240v you can swap the trafo input connections (as detailed in 
>> datasheet) (and change fuse) to 120v operation and the output 
>> voltage is still accurately trimmed! I wasn't 100% sure that this 
>> would be the case, but I'm happy that it is!
>>     
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>>     
>
>
> Harry Bissell & Nora Abdullah 4eva
>   
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