Re: Contactor question, Arc Suppressioni

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Steve Ward <steve.ward@xxxxxxxxx>

Its off if its DC across the contacts (im assuming Bart was dealing
with DC) ;-).  Though, good catch Gary, people should be aware that
just sticking a cap across the contacts will still pass AC, though
ballasted to a low current by the caps impedance, still not "off"!!!

On 8/16/05, Tesla list <tesla@xxxxxxxxxx> wrote:
> Original poster: "Lau, Gary" <Gary.Lau@xxxxxx>
>
> 100 uF and 0.1 Ohm across the contacts?  It's hardly off then, when the
> contacts are open.  At 120VAC, 3.2A RMS will flow.
>
> Gary Lau
> MA, USA
>
>
>  > Original poster: "Barton B. Anderson" <bartb@xxxxxxxxxxxxxxxx>
>
>  > Besides changing the
>  > circuit to prevent a short should the contact weld closed, I also
>  > used a resistor and capacitor across the contacts "at the relay"
>  > which was the last to turn off (via new time delay just so I could
>  > direct the arc potential to a particular set of contacts). Through
>  > trial and error, I eventually stopped the relay arcing (I think I
>  > ended up at 0.1 ohms and 100uF) for this particular relay.
>
>
>