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Old 06-27-2015, 02:40 PM   #1
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Main 30amp breaker trips

Previously said that 30amp trips when microwave and ac run. That kills all 110 circuits the indv breakers do not trip just main 30 amp
Last night got to trailer and and main 30amp was tripped with only hw heater and frig on. Had to throw everything out. Nothing else on
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Old 06-27-2015, 02:54 PM   #2
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You say nothing about age model of trailer but I guess it doesn't matter...
A loose wire at the breaker could make it heat up and trip.
SHUT OFF POWER TO THE TRAILER then look for loose/burned wire at the breaker
itself.
It's also possible the main breaker is simply bad.
That's rare but not unheard of.
IF it were me- I change the main breaker after a few other visual checks.
A plug in 30 amp single pole breaker is less than $4 at HomeDepot.
It's a pretty simple change out but I'm not telling you to do it-- just saying what
I'd do.
IF you feel confident you can probably do it yourself.
BE SURE TRAILER IS UNPLUGGED FROM SHORE POWER!!!

IF a new breaker trips then you have to look further.
Good luck and BE CAREFUL.
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Old 06-27-2015, 02:57 PM   #3
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Quote:
Originally Posted by KyDan View Post
You say nothing about age model of trailer but I guess it doesn't matter...
A loose wire at the breaker could make it heat up and trip.
SHUT OFF POWER TO THE TRAILER then look for loose/burned wire at the breaker
itself.
It's also possible the main breaker is simply bad.
That's rare but not unheard of.
IF it were me- I change the main breaker after a few other visual checks.
A plug in 30 amp single pole breaker is less than $4 at HomeDepot.
It's a pretty simple change out but I'm not telling you to do it-- just saying what
I'd do.
IF you feel confident you can probably do it yourself.
BE SURE TRAILER IS UNPLUGGED FROM SHORE POWER!!!

IF a new breaker trips then you have to look further.
Good luck and BE CAREFUL.
X2

Op has 2014 Wildwood 31QBTS
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Old 06-28-2015, 07:20 AM   #4
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Quote:
Originally Posted by reblanchard View Post
Previously said that 30amp trips when microwave and ac run. That kills all 110 circuits the indv breakers do not trip just main 30 amp
Last night got to trailer and and main 30amp was tripped with only hw heater and frig on. Had to throw everything out. Nothing else on
There is a lesson here:

ALWAYS leave the fridge in AUTO with a propane tank turned on if you will be away from the camper. The unit will immediately switch by itself from AC to gas and save your food.

Running the water heater on electric while you are away from the camper is a waste of resources, IMO. Seems wasteful to me and in this case caused you a problem you most likely would not have had if it was off.

Check the power center for loose/ burnt wires as stated. High resistance under high load (water heater again - 1500 watts! - 13 amps) will cause a LOT of heat.
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Old 06-28-2015, 07:28 AM   #5
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There is a lesson here:

ALWAYS leave the fridge in AUTO with a propane tank turned on if you will be away from the camper. The unit will immediately switch by itself from AC to gas and save your food.

Running the water heater on electric while you are away from the camper is a waste of resources, IMO. Seems wasteful to me and in this case caused you a problem you most likely would not have had if it was off.
I was wondering very same thing. Maybe the water heater is the cause though if it's the only high use device that was on.
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Old 06-28-2015, 08:01 AM   #6
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Originally Posted by davel1971 View Post
Maybe the water heater is the cause though if it's the only high use device that was on.
Repeatedly tripping the 30amp breaker could have possibly weakened it so it is tripping at a much lower draw.

It's also possible that the WH element has been toasted and is shorting out. The thermistor relay is also something that should be checked even if it's just to rule it out.

Just some ideas.
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Old 06-28-2015, 08:10 AM   #7
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So, if it was a bad water heater or something on that branch drawing lots of power, the water heater branch CB would have tripped; not the main.

For the main to trip (only), the camper (in total) is drawing more than 30 amps long enough to trip the main (without overloading a branch) or the 30 amp main CB is actually bad. (if it was the main feed line the pedestal would have tripped).

I suspect there is more than one high amp branch and the total is causing the problem.

First MAKE SURE the DW did not leave her curling iron plugged in.
(Don't ask how I know this is a show stopper).

Then, a careful inspection of the wiring at each AC outlet and circuit breaker is needed.
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Old 06-28-2015, 08:33 AM   #8
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Originally Posted by Herk7769 View Post
So, if it was a bad water heater or something on that branch drawing lots of power, the water heater branch CB would have tripped; not the main.
Theoretically. But if the main breaker has been weakened, a short or bad relay on the water heater leg 'could' trip the main before the WH CB has a chance to.

"If" the tripping is due to a short, then the WH would be a more likely suspect

It could very well just be a bad main, or it could be a combination of the WH (pulling 1500watts), the reefer (pulling 350-500watts), and the converter (pulling 600-1000watts when charging batteries) with no short coming into play.

Just tossing out ideas in the event replacing the main doesn't resolve the problem.

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Old 06-28-2015, 08:45 AM   #9
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Originally Posted by Herk7769 View Post
So, if it was a bad water heater or something on that branch drawing lots of power, the water heater branch CB would have tripped; not the main.
duh, what was I thinking
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Old 06-28-2015, 09:12 AM   #10
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Originally Posted by Yarome View Post
Theoretically. But if the main breaker has been weakened, a short or bad relay on the water heater leg 'could' trip the main before the WH CB has a chance to.

"If" the tripping is due to a short, then the WH would be a more likely suspect

It could very well just be a bad main, or it could be a combination of the WH (pulling 1500watts), the reefer (pulling 350-500watts), and the converter (pulling 600-1000watts when charging batteries) with no short coming into play.

Just tossing out ideas in the event replacing the main doesn't resolve the problem.

Yes, that makes a great deal of sense as well.
Another reason why I have to have a darn good reason to run the WH on electric besides saving a few dollars per season in propane (I do turn it off when away from the camper for the day). Takes about 10 minutes to bring back to temp.
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