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Subject: Re: Help with relays please.
Date: 26 Sep 2002 14:05:54 GMT
Organization: Concentric Internet Services
X-Mailer: Mozilla 4.79 [en] (Win95; U)
Martin Perry wrote:
> I have a truck winch that is controlled by a number of relays. The
> relays fail after a short period of time. There is nothing wrong with
> the winch motor. The 12 volt relays switch 12 volts at a peak current
> of about 400 amps. Would it be possible to replace each relay with a
> triac and a simple circuit? Any help would be appreciated.
> Thanks, Martin Perry
That's a lot of current. I would suggest finding out why they burn out
so quickly. A Triac would latch on with DC current, IIRC. So would an
SCR. Regardless of that, a Triac that would handle that much current
would be very large and the heatsink for it would be even larger.
Is the coil of the relay burning out or are the contacts? If it's the
contacts, then the relay is either not properly rated or it's too cheap
to handle the current effectively. If it's the coil, then you likely
have a spike coming in and burning it up.
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