Gary L,
I use several Z4K's, if money is a problem pick up a couple old rebuilt ZW's and some 10 Amp resettable breakers, I have a few of them also. If you look around you can usually pick up a Z4K used Transformer for very reasonable money. Barry is correct as usual, set up correctly the Z4K needs no resetting, however neither does the old ZW. The ZW-L is a great Transformer also, if you want to remortgage your home to purchase a couple. Sooner or later I will find one used at a reasonable price however, to add to my power station.
PCRR/Dave