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Best practices for breakers for marine electronics?  


Peter Haeussler
Active Member
Joined: 1 year ago
Posts: 9
November 20, 2020 12:38 pm  

In retrofitting my old (1983) boat, it was set up mostly with one breaker per electronic device. Given the rapidly expanding number of electronic devices, I can quickly use up a lot of panel real estate putting one device on a single breaker. Moreover, the breaker sizes are pretty large relative to current draw (even a 2.5 amp breaker would be difficult trip a lot of marine electronics). So, I'm wondering what is the best way to provide power to a suite of devices. Perhaps one breaker goes to a fuse panel, which then provides power to a range of things you'd likely turn on at once? What do you do? I've not seen this topic addressed anywhere. 

Andrew Clark
New Member
Joined: 7 days ago
Posts: 1
November 23, 2020 10:25 pm  

Hi Peter, this sounds like what I have done recently. On my GB36 I have linked a DC panel mounted 15A breaker to a 12-circuit BLUE SEA SYSTEMS ST Blade Fuse Block. This gives me 100A per block/ 30A per circuit -- plenty of juice for my electronics including Furuno MFD, radar, sonar, VHF, autopilot, NMEA2K bus, etc.

In use I can flip off the breaker as I leave the boat and know that all of the connected devices are powered safely off. And recently I have seen ST-sized micro breakers that will fit in the blade sockets, so I might start replacing these as well which will give me even more control over the individual circuits. 

Cheers, Drew