[HomeBrew] AC vs DC Breakers

[James Kearman]

Jim Miller KG0KP wrote:
> Can a 120v 30A circuit breaker be used as a 30A breaker in "12V" operation?

Depends. Under short-circuit conditions, there is a large arc on break. 
If the contact spacing isn't large enough, you could sustain a dc arc, 
whereas an ac arc might self-extinguish at the zero crossing point. 
There are breakers designed for dc applications, often used on boats, or 
with solar arrays. I'd suggest using one.

http://www.iboats.com/AC_DC_Marine_Circuit_Breakers/dm/view_id.446101

73,

Jim, KR1S
http://qrp.kearman.com/