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Re: Contactor question, Arc Suppressioni
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- Subject: Re: Contactor question, Arc Suppressioni
- From: "Tesla list" <tesla@xxxxxxxxxx>
- Date: Tue, 16 Aug 2005 14:06:13 -0600
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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.