Just some comments..... a bit of insight into the design of both of them;
A GFCI BREAKER has a dual function 1. To open on current overload (short circuit, too much power draw) 2. To open on Ground Fault. (illegal current exceeding 5 mA, flowing to ground)
A GFCI INTERRUPTER has only a single function...to open on 'ground fault'.
I know of situations where inductive loads within the spa (especially one's running on one leg -120V in a 240V installation) did "fool" the GFCI breaker into false trips. These combination breakers in the higher Amp ranges also seem to be a bit sensitive to line irregularities, spikes, electrical noise, etc....causing false trips.
I have found that installations with seperate devices ...standard breaker in the house load center panel and another GFCI interrupter with manual disconnect mounted near the spa (not closer than 5"...consult your local code) cause far less nuisance trippings. ....yes, it's more money.
The service guys also like the local disconnect. You just pull it out, put it in your pocket and there is no way you can get zapped...vs. a single GFCI breaker in the house where someone could accidently turn it on
while you still have your fingers in it.....safety!
There is also one spa-side unit I know of, which features an additional 15Amp breaker for a std. 115Vac outlet (GFI protected as well ) for patio lights, etc.
Watch the total current load! The spa-side GFCI is rated normally at 50A max.
Happy tubbing.....
hotharold
