DC Breakers - Continuous Amperage Ratings

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Re: DC Breakers - Continuous Amperage Ratings

Postby bdosborn » Tue May 30, 2017 9:03 pm

P.S. The Bussman CB is 100% rated. Took me awhile to find the info:

Cut Sheet Linky

BUT, take note of the temperature derating curve! Anything over 77F and the FLA rolls off.

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Re: DC Breakers - Continuous Amperage Ratings

Postby bdosborn » Tue May 30, 2017 9:09 pm

John61CT wrote:
bdosborn wrote:Amazon Linky
Wow that's cheap, almost suspicious?

And I would definitely test it out, check for delay. . .


I have one on my inverter and haven't had any issues. But I only have a 1000W inverter and a Keurig is my biggest load.

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Re: DC Breakers - Continuous Amperage Ratings

Postby John61CT » Tue May 30, 2017 9:14 pm

The real test is a high-amp dead short, instantly preventing a fire.

I'll stick to fuses at the bank myself, but this would be cheap enough to use just as a cutoff switch anywhere else along the wire.
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Re: DC Breakers - Continuous Amperage Ratings

Postby bdosborn » Tue May 30, 2017 9:23 pm

flboy wrote:Hi Bruce. I have 3 115Ah batteries and a pure sine wave inverter. I was reading the current across a shunt in the battery return in this case. I can also use my watt meter on the inverter output and work backwards with Ohms law taking into account the inverter is only 90% efficient. Either way is pretty close. In any case... nowhere near the 200Amp stated for the breaker.


Well, it looks like you did it up right. Unless you have a skinny wire to the inverter I think you're right. Cheap breaker... :roll:

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Re: DC Breakers - Continuous Amperage Ratings

Postby flboy » Thu Jun 01, 2017 6:23 pm

flboy wrote:I ordered a Blues Seas 300A ANL Fuse and Fuse Block. I am going to give that a shot. It should handle the max surge of the inverter and run comfortable at 50% of rating for max continuous.



I received the Blues Seas 300A ANL Fuse and Fuse Block.. Installed, tested, and I am happy that it works great. I only get 700mV total loss running 1100W at ~100A (through the entire 4.5 ft. of wire and fuse). It was twice that with the other setup.

I ran that load for about 4 minutes and then the inverter fans kicked on as expected... The fuse barely get warm. What a difference quality makes. :thumbsup: :thumbsup: :thumbsup: I am a new BUSS fan if that is who makes Blues Seas stuff!
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Re: DC Breakers - Continuous Amperage Ratings

Postby bdosborn » Thu Jun 01, 2017 7:06 pm

All right then, fire up that microwave and lets have some hot chocolate! :lol: :thumbsup:

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