Some buzzing is normal. The EMS-HW30C has 120 volt relay inside. When plugged into power there's a control module that tests the incoming power. If the power tests good, the module sends 120 volts to energize the coil of the relay, closing the contacts to pass power to your converter and breaker panel.
I had some pictures of the EMS-HW50C but can't seem to find them right now. The difference between the two is the HW30C is a single phase starter and the HW50C is a 3 phase starter.
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Richard & Jill
2014 Flagstaff 832IKBS Classic Super Lite
2018 Silverado 1500 Crew Cab Z71 4WD All Star Edition
Camping since 1989, Seasonal since 2000.
Car Shredder Op/Tech, Scrap Metal Recycling - retired
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