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Re: [TenTec] Airpax Breaker Part and Source

To: tentec@contesting.com
Subject: Re: [TenTec] Airpax Breaker Part and Source
From: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Reply-to: geraldj@weather.net, Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Tue, 14 Dec 2010 10:56:35 -0600
List-post: <tentec@contesting.com">mailto:tentec@contesting.com>

On 12/14/2010 10:18 AM, art davis wrote:
> Yes they do, but you have to look past the marketing and look at the data 
> sheet. According to the trip curve for their "instant" breakers, the typical 
> operating time for current of 2X the breaker rating is just over 100 
> milliseconds, where the "non-instant breakers can hang in for over a second 
> at the same current. Definitely faster, but far from "instant". In fact the 
> fastest time they are guaranteed to operate is 10 milliseconds and that's at 
> currents at least 8 X the breaker rating (i.e. 160A for a 20A breaker).
So would you accept "instant" as being correct, if the breaker tripped 
within a nanosecond of the short occurring for each foot the short was 
from the breaker? (speed of light in wire)?

73, Jerry, K0CQ
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