DC relay for 48V Power Vent [RE-wrenches]

[Darryl Thayer]

HI John
Once I used a solid state relay from Grainger, (for 48
volt fan) it was very small, an could switch from a 12
volt source to drive and capable of switching a 60v?
DC load of 3 amps?  if my memory is correct.  It is
still working I think.  also it was quite small if I
remember correctly.
Darryl


--- Windy Dankoff <windydankoff at mac.com> wrote:

> 
> John,
> 
> I agree with Christoper. I also add that mechanical
> switch contacts  
> rated at X Vac will have about the same arc
> potential (equivalent amp  
> rating) at 1/2X VDC. Therefore, a common 125VAC
> (contacts rating)  
> relay should work fine at the normal range of 48V
> system, especially  
> with oversized contacts.
> 
> To confirm this, look at relay specs. They usually
> do show DC voltage  
> ratings being about half that of their AC ratings.
> In that case, you  
> are really covered.
> 
> Windy
> 
> 
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