Description：

72.5kV Three-phase AC Dead tank type SF6 circuit breaker is suitable for the rated voltage of 66kV, the rated frequency of 50Hz of the high-voltage transmission and transformation system, through the distribution and combined load current, interrupt the fault current, to achieve the control, measurement and protection of the transmission line, the product structure is compact, the area is small, especially suitable for earthquake-prone areas, polluted areas and areas with relatively small space size. The circuit breaker has excellent breaking performance, and the rated short-circuit breaking current can reach 31.5kA; The product is easy to install and maintain.

Main Features：

• Excellent breaking performance and long electrical life (＞20 operations).

• Long mechanical life (10,000 cycles), reliable operation, frequent operability, low noise, simple structure, and long maintenance-free period.

• Low center of gravity, suitable for seismic-prone areas.

• Out-of-step breaking capability, usable as a tie circuit breaker.

• Configurable built-in CTs per user requirements, with up to 15 current transformers for measurement or protection.

Technical specifications：

Main mechanical characteristics：

Product use environment：

• Place of use: outdoor.

•  Ambient air temperature: -40°C~ +40°C.

• Altitude: no more than 1000m.

• Air pollution level: Class IV.

• Wind pressure: not more than 700Pa (equivalent to wind speed 34 m/s).

• Earthquake level: no more than 9 degrees.

• Relative humidity: the average daily relative humidity is not more than 95%; The average monthly relative humidity is not more than 90%.

Note: When the use conditions of the circuit breaker exceed the above provisions, it shall be determined by the user and the manufacturer through negotiation.