Dead-Tank SF₆ Circuit Breaker

Rated voltage: 40.5/ 72.5/ 126/ 145/ 252/ 363/ 420/ 550/ 800kV
Rated frequency: 50 Hz /60 Hz
Rated current: 4000 A / 5000 A
Rated short-circuit breaking current: 63 kA
Short-time withstand current: 63 kA, 3 s
Peak withstand current: 171 kA
Interrupter: Single-break puffer type
Operating mechanism: Disc spring hydraulic, phase-separated operation
Operating sequence: O‑0.3s‑CO‑3min‑CO
Mechanical endurance: 10,000 operations (Class M2)
Electrical endurance: 20 full-capacity breaking @63 kA
SF₆ filling pressure @20℃: 0.6 MPa(g)
SF₆ annual leak rate: ≤0.5%
Ambient temperature: -30℃ ~ +40℃
Altitude: ≤2000 m
Features: Built-in tank CT; porcelain / composite bushing optional