The common circuit breakers in the marine market are taken from the electronics industry. Blue sea only sells 30 amp multi-pole breakers because that it the standard shore power cord and that is what the C/B protects - the wiring.

I was just on the Newark Electronics website and found a Carlingswitch 15 A three pole C/B in the style used on boats - with a dual red toggle.

I am sure you can find these at places like Allied Electronics and Mauser as well. There are far more versions of these breakers than you will find in the Marine catalogs.