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Hpa manual 1veb 580901 912 edition 1 99 12 sf6 circuit breaker manual abb distribution contents page 0. Iec sf6 mechanical circuit breaker hpa is the family name of abb medium voltage equipment that are no longer in active phase and are managed by abb service according to the abb life cycle management policy and services. The hpa 36 type circuit breaker is designed and type tested to meet requirements of iec 56 is 13118 salient features the hpa 36 type circuit breaker belongs to the hpa series of breakers which use sulphur hexafluoride sf6 gas as insulation and arc interruption medium