Blue Sea 7271 300A C-Series Triple Pole Toggle DC Circuit Breaker 
C-Series Toggle DC Double Pole
PN: 7271 Poles: 3 Color: White Amperage: 300A
Provides overcurrent protection for inverters, bow thrusters, and windlasses
Combines switching and circuit protection into a single device
"Trip Free" - cannot be held closed after trip
WARNING: This product can expose you to chemicals including di(2-ethylhexyl)phthalate (dehp) which is known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.