[sdiy] Rotary switch

[Bob Weigel]

I think most of them are 3A rated or some such thing so that sounds a 
little heavier than typical rating.   I have some slightly larger than 
typical  looking ones here and they rate

2.5A at 250V
5A at 125V
.5A at 125VDC

The reason being of course .5A only on DC is during break, AC cycles 
through 0V spells and it's all about the breaking of the arc in a 
reasonable amount of time.  So long as the contact is more than 
10microns away or something ...what is air's resistance to arc....like 
1KV per mm.  But of course when arcing is resulting in atomization of 
conductive particles its a whole different picture.  Nonetheless the arc 
breaks when zero volts is reached at a distance of .1mm at least I'm 
sure in worst case.  120 times per second zero crossing occurs in 60 
cycle current.

Anyway hmm there's a big one but its 4PDT it appears...and a 17 position 
one like it single pole. THese are plenty big to meet the spec you want 
I think.but..what you are asking for sounds really oddball.  There are 
slide switches that do that kind of thing.   I may have something like 
that.  And mayber you could wire up a rotary to do that by using a diode 
if it's DC :-).  But otherwise..hmm..doubt I'll have anything like 
that.  I know all kinds of strange switches have been made though I just 
don't appear to have that.  Some multi section ones niy none of mine 
have contacts that touch a common and two others at once. 

Travis Shire wrote:

>Ok, now I know there are pack rats in this group like me. I'm looking for a
>power rotary switch. Nothing too burly, maybe 5-6a @120 VAC.  3 position
>with 2 seperate sets of contacts. Position 1 all contacts open, pos 2 set A
>closed, pos 3 both set A and B closed.
>Need this for a recently aquired tube regulated HV supply (yay! finally!)
>that had a reg off/on toggle kludged in eliminating the standby. I have some
>good quality Centralab rotary jobs, but I don't think the contacts will last
>on those.
>
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