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Old 01-26-2013, 01:28 PM   #1
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Circuit breaker blown out

I just got back home in my 2001 Diplomat 38A. I plugged into my 30 amp service as usual. It showed I was plugged into 50 amp service. I played with the circuit breakers. Still said 50 amp service. I tried the front AC, it didn't work either. Strange. I was just using it.
I pulled out the circuit breaker and this is what I found.


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The breaker was blown out on the rear side. Since it was on the power side of the breaker the breaker never tripped. I pulled the rest out and saw 4 more beginning to split in the rear. The main 50. Amp breaker was starting to melt on one side. I've never seen this before on the power side of the breaker. I replaced all the breakers with new ones. Now I read 30 amp service and my AC now works.
I will be checking these breakers on a regular basis.
Any ideas why this would happen on the power side of the breaker.
Thanks
Rick
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Old 01-26-2013, 01:36 PM   #2
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The most common cause is a high resistance connection.
By that I mean loose wire connections a common problem with mobile
systems.
You need to disconnect for power and make sure the inverter is off and check
all power connections to make sure they are tight.
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Old 01-26-2013, 04:42 PM   #3
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Will do

Thanks
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Old 01-26-2013, 05:35 PM   #4
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Those breakers, as you know, are installed by "hooking" them over a rod or edge at the bottom and then Pushing the top onto the bus bar.

Sometimes they tilt toward you a bit after install and when that happens contact with the bus bar can be,,, Kind of bad, Resulting in exactly what you see.

Push in on the top of all breakers from time to time May help to prevent this.
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Old 01-26-2013, 06:36 PM   #5
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Thanks. I agree. But they were on secure. I put square D breakers in which are a replacement for the T&B breakers used. I relaxed them all and cleaned all the contacts and wires. We have been traveling 5 months over the past 7 months. We have been on some bad weather.
I've noticed the past couple of months the front AC took a long time to start up. Now it starts in the usual couple of minutes. I want to share what I experienced so it may help someone else who may see some of the same symptoms.
Rick
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