Confirmation of 100% duty cycle, OB breakers [RE-wrenches]

[Dan Rice]

Chris,

While on the topic of Outback breakers, it has been noted that the new
Flexware literature indicates that the OBPV and other DC breakers 80 amp and
smaller are rated for 125 VDC maximum. Though the OBPV breakers have always
been labeled 125 VDC (I'm not sure about the E-frame breakers), has there
not been another supplemental testing and listing process that has resulted
in the previously published 150 VDC rating? Is the 125 VDC rating printed in
the Flexware literature correct? What about the other DC breakers?


Thanks,

Dan Rice

Abundant Sun, LLC.


----- Original Message -----
From: "Christopher Freitas --- OutBack Power" <cfreitas at outbackpower.com>
To: <RE-wrenches at topica.com>
Sent: Tuesday, November 07, 2006 11:58 AM
Subject: RE: Confirmation of 100% duty cycle, OB breakers [RE-wrenches]


|
| Phil -
|
| Sorry for the delay - I was out of the office last week.
|
| All of the breakers used on in the OutBack products are 100% rated
| hydraulic-magnetic type breakers EXCEPT where we have used the square-D
| breakers in the AC bypass assemblies (which are being replaced with the
| new FLEXware systems which use only the OutBack/CBI type breakers.
|
| We did run the 100% approval tests on the PSPV with the box completely
| loaded with 15 amp breakers carrying a total of 180 amps DC through it
| (a total of 12 breakers @ 15 amps each).  So it is not an issue there.
|
| We also did testing on the DC versions "PS" enclosures for 100% testing
| but it was not as thorough as what we did on the PSPV.  Since the AC
| versions of the "PS" enclosures did not have all 100% rated breakers in
| them we did not test these versions at all.
|
| So - the bottom line is that the PSPV is acceptable for 100% duty use -
| the PS2/PS4 DC enclosures and somewhat.  We are starting to ship the new
| FLEXware enclosures versions and we are completing the 100% testing on
| them - both the AC and DC versions.
|
| Althought the hydraulic/magnetic breaker's trip level are not affected
| by the breaker's temperatures - the breakers will get warm which could
| cause the terminals of the DC breakers reaching the temperature rating
| of the cable and terminals involved. We do not pack in as many breakers
| together in the DC enclosures so I have not seen temperature rise to be
| a big deal in my experience.  The AC boxes might be where temperature
| issues occur - but most systems can live with a 80% dearte if required.
|
|
| I will follow up on this once we complete the tests - probably next
| week.
|
| Christopher
|
| pundercuffler wrote:
| >
| > Christopher,
| >
| > Can you help clarify an issue that arose during a John Wiles training
| > yesterday?
| >
| > Are the OBDC, OBAC and OBPV breakers rated for 100% duty cycle as
| > mounted in their enclosures?
|
| Christopher Freitas
| OutBack Power Systems, Inc.
| cfreitas @ outbackpower.com
| www.outbackpower.com
| Arlington WA USA
| Tel 360 435 6030


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