[Heathkit] Question on the SB-230

[rbethman]

Well,  Just did a quick search on the WWW.

120VAC fuse for 14A max

240VAC fuse for 7A max.

This enough to work with?

Bob - N0DGN

On 12/28/2010 4:23 PM, Mike McCarty wrote:
> Cold Old Stone Crab wrote:
>> Got one of these that cleaned up pretty nicely for its age!
>> Unit is wired for 115V ac. Info has been had on how to rewire it for 230Vor
>> 240V A/C. No info on the other hand has been found about a fuse change or is
>> there no necessity for a fuse change? Can't find any thing on this subject;
>> help please!!!
>> Thank you,
>
> When changing mains supply it's pretty easy to figure the
> fuse change. The total power remains constant, so
>
> P = E*I
>
> If the fuse is rated for, say 3 A, and you double the voltage
> supply, then the actual current demand is cut in half, and one
> can do the same for the fuse, that is, use a 1.5 A fuse.
>
> If you go the other way, that is cut the line voltage in half,
> then the current demand doubles, and one would double the fuse
> rating, in this case to a 6 A fuse.
>
> HTH
>
> Mike

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