& to throw biz the way of some friends at a better price ( not including
shipping )...
https://www.wholesalesolar.com/8991041/midnite-solar/breakers/midnite-solar-mndc-gfp63
On 12/28/18 8:11 AM, ch...@wbmfg.com wrote:
I generally use these guys:
http://www.midnitesolar.com/products.php?menuItem=products&productCat_ID=16&productCatName=Breakers
*From:* Ken Hohhof
*Sent:* Friday, December 28, 2018 9:05 AM
*To:* 'AnimalFarm Microwave Users Group'
*Subject:* Re: [AFMUG] DC Breakers
Are you talking the AC or DC voltage rating? DC rating is usually
lower, because it is harder to quench the arc when opening the circuit
if the polarity doesn’t alternate. It’s usually difficult to find
breakers with a DC rating higher than 48 volts. But a higher voltage
rating is not a problem, just may cost a little more.
You also need to look at the trip curve for the family of breakers. The
Altech/Sursum DIN rail breakers I usually use are not technically DC
breakers, but they come in a bazillion different trip curves, I usually
buy B or C. There will be a graph that shows the min/max trip time for
various percent current over rating. Usually that will take care of
inrush unless you have a load that has an unusually large or long
lasting inrush. So something between 1 and 2 times expected load.
Let’s face it, if the load is 1.7 amps, you aren’t going to have a 1.7
amp breaker in your stock of breakers, maybe you have 2 and 5 amp
breakers on hand. In that case I’d probably go with the 2 amp, because
5 amps may not offer much protection, especially since you probably have
to get to 200% of rating for it to trip quicky. The exception is any
kind of DC UPS that draws extra current when recharging the batteries,
you need to allow for that, or everything will seem fine until the first
time you are recharging the batteries after a power outage, and the
circuit breaker trips after about 30 seconds.
*From:* AF <af-boun...@af.afmug.com> *On Behalf Of *Jason McKemie
*Sent:* Friday, December 28, 2018 9:37 AM
*To:* AnimalFarm Microwave Users Group <Af@af.afmug.com>
*Subject:* [AFMUG] DC Breakers
Do you generally size these about double the expected load?
I see a lot of them rated at higher voltages than I need, will these
still be effective?
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