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Hpa manual 1veb 580901 912 edition 1 99 12 sf6 circuit breaker manual abb distribution contents page 0. Outdoor sf6 circuit breaker type ohb instruction for storage installation service and maintenance the circuit breaker poles contain sf6 at a pressure of 380 kpa for circuit breaker opening for manual opening press the pushbutton 13 when there is a shunt opening release. Save in an sf6 circuit breaker sulphur hexafluoride gas is used as the arc quenching medium the sulphur hexafluoride gas sf6 is an electronegative gas and has a strong tendency to absorb free electrons the contacts of the breaker are opened in a high pressure flow sulphur hexafluoride sf6 gas and an arc is struck between them the gas . Hpa breaker the hpa type circuit breaker is designed and tested to meet requirements of iec 56 is 13118 sf6 gas used as insulation and arc interruption medium arc control and extinction achieved by puffer principle capable of interrupting small magnetizing and capacitive currents