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Author Topic:   Circuit Breaker Replacement for Fuse
jimh posted 01-07-2011 10:11 PM ET (US)   Profile for jimh   Send Email to jimh  
Today I came across this listing of miniature circuit breakers from E-T-A which can fit into the normal blade fuse holder (typically found on automobile fuse blocks). This might be an interesting alternative to fuses for some boats which have a blade-fuse type secondary power distribution panel. You can replace fuses with circuit breakers just by inserting these miniature circuit breakers into the fuse holder sockets. The cost is not too bad, about $8 per circuit breaker.

Catalogue information:

I have not yet researched this device to see if it will fit into typical marine fuse panels sold by BLUE SEA SYSTEMS, such as their ST BLADE FUSE BLOCKS.

If these breakers will fit into such a standard panel, they would make an interesting option for boaters who desired circuit breakers instead of fuses.

Chuck Tribolet posted 01-08-2011 10:15 PM ET (US)     Profile for Chuck Tribolet  Send Email to Chuck Tribolet     
I've seen these a Kragan Auto Parts. O'Reiley, Schuck, and
Checker are all the same company and will probably have them.


davej14 posted 01-09-2011 10:54 AM ET (US)     Profile for davej14  Send Email to davej14     
My boat is in storage so I cannot make an actual measurement but I am 99% sure that the breakers will not fit with the cover on the fuse block. The BlueSeas website doesn't actually dimension the inside of the cavity but the overall height dimension is 1.518":

The breaker needs 1.102" to operate:

If you add .1" for clearance and another .1" for cover thickness that would make the maximum thickness of the base .216". I'm sure that the base is at least 2X that thickness. There is no reason that the cover would need to be used. Even better would be to modify the cover to allow the top of the breakers to protrude.

jimh posted 01-09-2011 06:07 PM ET (US)     Profile for jimh  Send Email to jimh     
Dave--Thank you for the comments regarding the cover plate. I had not even considered that aspect of the fitment.

Chuck--Do your local automotive retailers sell E-T-A branded circuit breakers?

Chuck Tribolet posted 01-10-2011 04:44 PM ET (US)     Profile for Chuck Tribolet  Send Email to Chuck Tribolet     
I'll have a look on the way home.


Chuck Tribolet posted 01-11-2011 08:36 AM ET (US)     Profile for Chuck Tribolet  Send Email to Chuck Tribolet     
Turns out it was something very similar, but not quite the
same form factor.


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