... 5/72.5/126/145/252/550KV Main Characteristics1. The breaker, dead dank style, three phases interoperate, automatic relcosing ... waves. 3. Excellent operating mechanism The mechanism, HMB-8 hydraulic operating mechanism manufactured by ABB Company, provides reliable operation, ... less than that of other mechanism. 4. Module designThe breaker is of module design, which simplifies the structure, increases ...