Any online marine equipment store sells them, so does West Marine. A Blue Sea will run you around $25. That's the best. Be sure to get the size called for in your TM manual and make sure the wiring is correctly sized. Circuit breakers re rated by amperage capacity, not voltage.
2015 Seaark 1872 MV CC Etec-90
Helix 12 CHIRP SI, HB 1199, MinnKota Riptide ST80/i-pilot Link, Bob's Hydraulic
Bitter Gun Owner