[AMRadio] Vacuum or electronic relay


DAVID O'NEILL W9NTO at ISP.COM
Fri Dec 1 15:00:59 EST 2006


>YOUR BEST CHOICE MAY BE A 40 AMP MURCURY RELAY.WW.GRAINGER HAS THEM.




 Brian,
>
>
>
>    Pioneer Breaker Supply has an Ebay auction, Buy it Now, relays for
> $9.95 each:
>
>
>
> New Relay 30 Amp 120 Volt AC Panel Mount  								Item number:
> 								150054261261
>
>
>
>
> Buy two of these since they are SPST 30A with 120vac coil.
>
> IMHO I would stay away from Solid State relays when the load is not
> resistive. Yes you can get away with it if you oversize the SSR
> accordingly, but even then the zero crossing circuitry triggering the dual
> SCR or Triac firing might get fooled, and lead to some form of
> instability. With a SSR you also want a mechanical switch in series with
> the AC line in case the SCR's/Triac short out...could be a safety problem.
>
> Regards,
> Jim
> JKO
>
>
>>I am using an old relay from a BC-610 to apply primary
>
>>voltage
>
>> (110vac) to a HV transformer in my rig.  I would like to
>
>> replace this
>
>> with a vacuum relay or something similar.  The contacts
>
>> need to carry
>
>> about 25 amps on each pole, one for the final supply, and
>
>> one for the
>
>> modulator plates on a separate HV transformer.  Have any
>
>> of you bc-610
>
>> owners done this upgrade?  If so, can you recommend a good
>
>> relay for
>
>> this?  Prefer one with a 110 volt coil.
>
>>
>
>> Thanks.
>
>> Brian / w5ami
>
>
>
>
>
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