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Re: [TenTec] Airpax

To: tentec@contesting.com
Subject: Re: [TenTec] Airpax
From: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Reply-to: geraldj@weather.net, Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Tue, 11 May 2010 00:53:36 -0500
List-post: <tentec@contesting.com">mailto:tentec@contesting.com>
There used to be specification on the Tentec web pages or the Corsair 
manual. I've moved mine and its not handy at the moment. Primarily its a 
20 amp Airpax magnetic breaker with no time delay and rated for DC.

Specs posted to this forum in 2006 said:
> In the data sheet for the TEN-TEC Model 1140 Magnetic Circuit Breaker is the
> following:
> (the 1140) "is a special fast-acting magnetic circuit breaker which trips
> between 10 and 20 milliseconds, typically.
> In the section of same data sheet, under "Specifications" appear:
> Model: 1140         Operating Rating: 18 amps        Trip Rating: 24.9 amps
> Regards,
> Mike N4NT

In that discussion I posted:
> K0CQ:
>  >The 25 amp fuse is too insensitive for PA protection. Neither it nor a
> 25 amp breaker are likely to trip at less than 125% which they should
> hold indefinitely, that's 31.25 amps. That's why I use a 15 amp fuse to
> protect my Corsair II and it has so far. It seems to be as effective as
> the Airpax which I don't have. That 15 amp fuse from a reputable
> manufacturer (I use nothing but Buss fuses, no off shore products) seems
> to be fast and sensitive enough.

The standard breaker specified by TenTec is:
>>         We need an Air Pax T11-1-20.0A-01-11C-V and the
>> website to order is:
>> http://www.pocosales.com/Airpax.htm

And I posted back then:
>> Note that some of the portions of this part number are for mounting
>> hardware and handle color and there could be more than half a dozen
>> useful variations. You can find those variations on the pocosales web
>> page too.

Though there are other airpax packages and mounts that meet the same 
minimum time delay specifications. And I believe the fuse that I use is 
as fast because I'm running the fuse current above the ratings, based on 
comparing the fuse and airpax breaker interrupt curves. I know I've 
blown two or three fuses on my Corsair II supply line, when tuning an 
antenna tuner and getting too far off resonance. I use the 15 amp ATC 
fuse from Buss.

Where or whether such breakers can be bought today, I don't know.

73, Jerry, K0CQ

On 5/10/2010 10:31 PM, Ron Notarius W3WN wrote:
> A friend of mine, KG4CGC, is looking for an Airpax breaker or equivalent for
> his "new" Corsair.
> I don't know offhand what breaker to recommend to him, or where he can get
> it.  I know it's been discussed in the past, but I didn't bother to retain
> the information.
> Any tips on where I can send him?
> 73
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