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

[Darryl Thayer]

Phil and Chris 
Am I out of spec?  My 13 PSPV breakers have at peak
total current of over 500 Amps.  They are in a
slightly modified PSAC (I opened the cutout a little
wider to get the 13 brakers in).  The breakers are all
60 amp for the PSPV (I think),  They get very warm. 
Is there a limit to the DC current I can pass through
a PSAC or PSDC?    

--- Christopher Freitas  --- OutBack Power
<cfreitas at outbackpower.com> wrote:

> 
> 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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