The Fuji #2045B 15 Amp Breaker is for 2, 3 and 4 stage turbines. (For a stage 5 turbine, use the 18-amp breaker.)
Fuji #2045D 18 Amp Breaker for 5 stage turbines.
Fuji #2045D 18 Amp Breaker for 5 stage turbines.