It is good to go the AirPax web site and read the spec's on the
circuit breakers before ordering what you THINK might work.
For the Orion I think I would go with the 20A, the same as with
the OMNI and Jupiter and here is my reasoning. Go to the webs
site and follow along
http://www.airpaxppp.com/pppsite/tproduct.html
Since most of you are using the Fast trip I will start there
though I think the instant is the better choice.
Using a 20A breaker
The fast break at 100% rating WILL NOT trip in one HOUR.
At 135% rating (27A) it will trip in .3-7 seconds.
At 150% rating (30A) it will trip in .2-5 seconds.
At 200% rating (40A) it will trip in .1-2 seconds.
At 400% rating (80A) it will trip in .03-.5 seconds.
If you get a 22A breaker then these trip points are at 29.7, 33,
44, 88 amps. How fast and at what current do you want it to trip.
I think that if I drew 30amps I would want it to trip in no move
than one second and that MAY NOT happen even with a 20A breaker.
Now lets look at the 20A instant breaker.
The instant break at 100% rating will not trip in one HOUR.
At 135% rating (27A) it may trip.
At 150% rating (30A) it will trip in .1 seconds MAX.
We don't need to look at other currents from this point.
I bought a 20A Fast breaker and one time I saw 26A on the Astron
RS-35M meter and the breaker didn't trip so I killed the power
after about 5 seconds. At this time I went back to the 18A
instant breaker I had used with the Corsair II and now it will
trip at a max of about 24.3A though it happens so fast I can't
really tell but it's over 20A. Therefore with my Jupiter I use
the 18A instant though a 20A would be ok. With the Orion I think
that the 20A would be the best choice though a 22A MIGHT be ok if
you're willing to accept 33A and up to 5 seconds before trip.
73 Jim K4CGY
> The prior discussion about use of an Airpax circuit breaker was
> concerned
> with the Omni. My new Orion and 963 power supply were delivered
> in early
> August. I complained about the noise of the fan and was told to
> buy a linear
> power supply without a fan. Currently, I am using an Astron
> RS-35A power
> supply with my Orion, which is driving a Drake L-4B into a
> ground mounted
> Butternut HF6V. My ham shack is on the second floor, and I did
> have some rf
> feedback problems on several bands when using the amplifier on
> SSB, but I
> now have that situation under control.
>
> The discussion about using an Airpax circuit breaker for an
> Omni seems to
> suggest that I should be using one with my Orion. A posting by
> Mike, W9WIS,
> listed the part number for an Airpax breaker, but the current
> trip point was
> 20A. My Orion manual states that the Orion should be connected
> to a 22
> ampere power, so I presume I should order a breaker with a trip
> point of 22
> amps. Does this seem reasonable?
>
> John, N9JG
>
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