current/time curve for 15A breaker

Discussion about the Power System PV Combiner (PSPV)

Moderators: OutBack Moderator Team, OutBack

Post Reply
phil
Forum Virtuoso
Posts: 83
Joined: Wed Oct 04, 2006 5:19 pm
Location: Puerto Rico

current/time curve for 15A breaker

Post by phil » Mon Oct 08, 2007 3:25 pm

Anybody point me to the time/current curves for the breakers used in the PV Combiner box? They're Circuit Breakers Industry (Rep. South Africa) DC telcom breakers but I can't get their website to respond, nor can i find the curves anywhere on the Outback web site.

Thanks,

Phil S

User avatar
crewzer
Forum Emperor
Posts: 1927
Joined: Mon Sep 27, 2004 10:50 am
Location: Vienna, VA

Post by crewzer » Mon Oct 08, 2007 4:35 pm

Phil,

The trip curve designator is printed on the front of the breaker itself. For the one spare CBI 15 A breaker I have laying around, it's labeled as "Curve KM" I was able to get to the CBI website fairly quickly this evening at ~7:30 PM EDT, and I found the KM curve in the QL frame's tripping characteristics.

See: http://www.cbibreakers.com/products_sel ... enu=fourth

HTH,
Jim / crewzer
090805 System Configuration: 966 W STC (849 W CEC PTC) 48V PV array, FM80, 24V x 400 Ah AGM battery bank, FX2524T w/ BTS, Hub-4 & Mate; Link-10 w/ BTS, & E-Panel.

phil
Forum Virtuoso
Posts: 83
Joined: Wed Oct 04, 2006 5:19 pm
Location: Puerto Rico

Post by phil » Mon Oct 08, 2007 6:10 pm

Crewzer -- Thanks. Exactly what I was looking for.

Finally got two breakers today after 4 weeks of mail-order hell. They're QY with a U2 trip curve. Couldn't find that exact curve on the CBI site but all the curves appear to be pretty similar. Have been operating two sets of 5 panels each, double-lugged on one 15 A breaker with noontime currents routinely up around 16 amps. No tripping and kind of wondered if it would ever trip. Looks like they'll tolerate 125% nominal pretty much permanently, which is fine since the module wiring is all #10. In fact, my new ones say "TRIP AMPS 19.5".

Tomorrow I'll swap in the two new breakers and it'll all be by the book!

Amazing company, CBI. Read one article that said they invented the first GFCI back in 1957 for mining applications.

Phil

User avatar
crewzer
Forum Emperor
Posts: 1927
Joined: Mon Sep 27, 2004 10:50 am
Location: Vienna, VA

Post by crewzer » Tue Oct 09, 2007 4:50 am

:cool:

Regards,
Jim / crewzer
090805 System Configuration: 966 W STC (849 W CEC PTC) 48V PV array, FM80, 24V x 400 Ah AGM battery bank, FX2524T w/ BTS, Hub-4 & Mate; Link-10 w/ BTS, & E-Panel.

Post Reply