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Go Back   SailNet Community > On Board > Gear & Maintenance > Electrical Systems
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Old 04-11-2012
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circuit breakers

i have a 1984 hunter 31. the main 110 volt circuit breaker has failed. the one that i have is a 120 volt 37 amp. it has 5 lugs on the back. on the 4 corners, one has the back wire, one has the green wire, one has the white wire and one has a white wre going to a bus. there ia a smaller lug in the middle that has a green wire going to i assume the reverse polarity light. it is mage by airpax. it has one toggle on the front. it is twice as wide as the others. i cannot seem to find a replacement exactly like it. what are my options?

thanks
mike
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Old 04-12-2012
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Re: circuit breakers

Mike, first off, welcome to Sailnet.

Options? Your only reasonable option is to call an electrician, since all other options involve hurt and pain for you and/or someone else on the boat.
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Old 04-12-2012
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Re: circuit breakers

Welcome aboard, Mike,

Swapping out a breaker is not heavy lifting, if you understand what is going on back there. If you don't and cross wires, you can cause serious trouble. Electrical fires are the most common boat fires. Way more than engines, gasoline, propane, etc. Further, when dealing with shorepower 110v, you're dealing with deadly current around water. Be very careful.

Personally, I understand AC current much better than DC (particularly battery charging as another thread has discussed). I'm a capable crimper, have the right tools, and use the right parts. I still want a pro to check what I've done or clearly advise me. I too ask around here for input, but always use that input to have an informed discussion about the problem with a local pro or supplier.

Airpax is still around, so I'm surprised you can't source a suitable replacement. What makes you believe it's the main breaker that has failed?
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Re: circuit breakers

i have power to the main circuit breaker, but nothing out of the main circuit breaker. therefore i figured that it is done
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Re: circuit breakers

Quote:
Originally Posted by mdhinson View Post
i have power to the main circuit breaker, but nothing out of the main circuit breaker. therefore i figured that it is done
Sounds like you're on it, assuming you are testing the correct lines. Have you tried Hunter directly? It would be common that you can't replace the exact style after all these years, but I would expect you could find something that fit. Since its a unique breaker on the panel, I would not think a slight difference would matter much.
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Re: circuit breakers

tested the correct wires. called hunter. no help. too old
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Old 04-12-2012
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Re: circuit breakers

If it is a standard size you can replace it with a Blue Seas breaker possibly. Any double pole breaker I have seen has 4 connections - hot feed and to load and neutral ifeed and to load. The green wire should be a ground and is probably going to the reverse polarity light - the other wire on the reverse polarity light will be the neutral. Below is a pic of the breaker and a wiring diagram that also shows the wiring for the reverse polarity light and the "on" led if you have one. You only need or want a 30 amp breaker for a 30 amp shorepower system. A larger breaker may cause the wires to burn in a fault before the breaker goes.
Attached Thumbnails
circuit breakers-1.jpg   circuit breakers-2.jpg  
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Old 04-12-2012
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Re: circuit breakers

Mike, Airpax is part of Sensata now. They should be able to tell you what can replace that.

Sensata Technologies 410.228.1500 (customer care)
Power Controls Business Center 410.228.4600 (main)
807 Woods Road 410.228.3456 (fax)
Cambridge, MD 21613 USA cmbinfoppp@sensata.com

I'll go out on the usual limb and suggest a conventional 30A breaker will replace it, except for having the reverse polarity light. While you are in there, see if you can find a breaker with a GFCI built into it, or consider adding one to your boat, at the AC power "inlet" from the shore power. That's modern standard and a very cheap investment in safety if you don't already have one.
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Old 04-23-2012
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Re: circuit breakers

as usual the forum comes through. all advice was good. finally found a replacement. mine isnt made any more. bass products was the company i ended up with. talked to an engineer and he sent me a wiring diagram on how to make his fit my application. simple and reasonable.

thanks guys

mike
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