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 Post subject: retrofit breaker
PostPosted: Mon Apr 28, 2008 1:53 pm 
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Joined: Mon Apr 14, 2008 7:10 am
Posts: 142
I have a few retrofit breakers in my system (GE AK-25 c/w Amptector 1A trip unit). When I use PTW32 to run the arc flash study, I found the trip/delay time of these breakers are only 2 or 3 cycles. I was told that I don't need to add breaker opening time to it. Has anyone seen such a fast action in your study before? Thanks in advance!


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PostPosted: Mon Jun 02, 2008 8:42 pm 
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Joined: Mon Jun 02, 2008 11:58 am
Posts: 1103
Location: Charlotte, NC
Noah wrote:
I have a few retrofit breakers in my system (GE AK-25 c/w Amptector 1A trip unit). When I use PTW32 to run the arc flash study, I found the trip/delay time of these breakers are only 2 or 3 cycles. I was told that I don't need to add breaker opening time to it. Has anyone seen such a fast action in your study before? Thanks in advance!


Not for that one, you need to add operating time, amptectors are more like 7 or 8 cycles for INST if I recall, contact GE for actual trip times or better yet, upgrade that Amptector 1A to something that actually works.


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