dave wrote:

I need to install a breaker for my model HD-3 arco roto-phase rotary
phase converter. it's basically rated "max single motor 3 hp, max total
motors running at any one time 12 hp."

it'll be a 2 pole breaker, but what amps should I use? this image shows
a nice closeup of the device nomenclature plate...

http://www.image-upload.net/files/5385/arco_tags.jpg

thanks for info guys :-)

toolie
'an electrically dumb guy'


Will depend on the rating of the motor you're running.

Go:
http://www.arco-electric.com/ApplicationGuide.cfm
Check out all the sections on the left pane.