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Topic: Why two transfer switches? (Read 609 times) previous topic - next topic

Why two transfer switches?

While researching portable EMS/surge protectors, I found that a lot of folks here recommend hard wiring one in after the transfer switch to protect against generator surge as well. I lift up the bed and see that I have two automatic transfer switches - a MagneTek ATS 100 and a Lyght LPT50CA. Is there a simple explanation?
1998 U295 36' No slides
Towing 2018 Jeep Wrangler
Previous rigs:
  1995 26' Fleetwood Flair
  1998 34' Fleetwood Bounder
  1997 40' Bluebird BMC
  1999 24' Winnebago Minnie Class C

Re: Why two transfer switches?

Reply #1 –
Quote from: Dan & Annie –
I lift up the bed and see that I have two automatic transfer switches - a MagneTek ATS 100 and a Lyght LPT50CA.

Is there a simple explanation?
Yes.  Two ATS switches for two different purposes.

One (LPT50CA) switches between shore power and generator.

The other (ATS 100) switches power supply to the inverter sub-panel between either direct AC power from main panel, or AC power produced by inverter (when shore power or generator is not available).

You should have a diagram similar to the one linked below in your Owner's Manual.

https://www.foreforums.com/index.php?action=media;sa=media;in=3269

1993 U280 SE 40' WTBI, Build: 4359
C8.3 300hp, 6-Speed, Exhaust Brake
960 watts on the roof (6 x 160)
Sorento (or BOLT) on a Kar Kaddy SS
"Nature abhors a vacuum"
 

Re: Why two transfer switches?

Reply #2 –
Some Foretravel models have two transfer switches and those that do are explained below. Those with only one transfer switch use inverter/charger's internal transfer switch, with the disadvantage of limiting amps when not inverting.