LW36-40.5, LW36-126 and LW36-252 high voltage SF6 circuit breaker self-energy series products, its interrupter designed using dual-chamber structure of the program and the thermal expansion chamber pressure chamber separated at 252 also uses a voltage level the upper and lower contacts while double-action motion programs to minimize the operating power. The design process using computer simulation technology for electrostatic field, gas pressure, temperature and other parameters were calculated arc chamber, so that the structure has been optimized.