I'm looking at replacing my transfer switch with a LPT50BRD Automatic Transfer Switch by ESCO. It has DC coils and mine is mounted in the overhead above the bed. The current one has a very loud 60 Hz hum. Wondering if anyone has had experience with this unit. I will be adding a separate EMS-HW50C 50 Amp Hardwired RV Surge Protector by Progressive Industries along with this, but in a different location because the transfer switch is not easily accessible. On a safety note, the power connections to the transfer switch were not down tight and the switch was not mounted to any surface.