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Old 04-01-2021, 03:36 PM   #1
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Fleetwood Owners Club
Join Date: Mar 2016
Location: Las Cruces, New Mexico
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2014 Fleetwood Excursion surge protectiry

Hello, my surge protector is buzzing/humming
No loss of power, plugged into 50 amp in park. Unplugged no change. $500 for a Mobil repair to come and just look.
Iím attempting to post the picture of it.
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Old 04-01-2021, 06:21 PM   #2
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Your surge protector/transfer switch has two AC contactors (with mecanical interlock) that will enable either shore or generator power. These contactors are the source of the 'humming' noise and this is not uncommon. A low voltage to the contactor coil will make it 'louder'.
My 50amp transfer switch can be heard when the cargo door is open, I don't recall hearing it when I'm in the motorhome as the AC is so much louder. This humming noise is not dangerous but a bit annoying
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