3 phase 208 volt
It appears that you have a 120/208 3 phase service
Any single pole or circuit breaker will give you 110 volts
Any double pole or two circuits A/B, A/C, B/C will give you your 208 volts single phase
All 3 phases A/B/C will give you 208 volt 3 phase.
One should know when to back away or something is over your head. Thats why there are specialists.