The series consists of the main switch body and a rotating mechanism for operation. It is suitable for frequencies of 50Hz and 60Hz, with the highest equipment voltage ranging from 40.5kV to 126kV. The tap changer is designed for oil-immersed transformers with rated currents ranging from 200A to 1600A. It can be fixed on the body or tank cover of the transformer and can be safely tapped and exchanged when the transformer is de-energized.