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60hz to 50hz converter, frequency converter
Each country is different in some regards, in USA, Canada a large apartment building would indeed have 3 phase Main service, typically at 120v / ...
converter, motor, abb
ACS510-01-03A3-4 ACS510-01-04A1-4 ACS510-01-05A6-4 ACS510-01-07A2-4 ACS510-01-09A4-4 ACS510-01-012A-4 ACS510-01-017A-4 ...