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unang pahina > Sentro ng Produkto > 35-220KV Power Substation Equipment > SF6 Circuit Breaker > LW36-72.5 Porcelain Post High Voltage AC SF6 Circuit Breaker 72.5kV Reliable Electrical Protection Substation Equipment

LW36-72.5 Porcelain Post High Voltage AC SF6 Circuit Breaker 72.5kV Reliable Electrical Protection Substation Equipment

    LW36-72.5 Porcelain Post High Voltage AC SF6 Circuit Breaker 72.5kV Reliable Electrical Protection Substation Equipment

    The LW36-72.5 Porcelain Post High Voltage AC SF6 Circuit Breaker provides reliable electrical protection for 72.5kV substations, combining robust porcelain post insulation with SF6 arc-quenching technology. Designed for durable and efficient operation, it ensures safe high-voltage switching, fault management, and long-term stability, making it ideal for industrial and utility power distribution systems.
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The LW36-72.5 porcelain post-type high-voltage AC SF6 circuit breaker is equipped with a CT20 spring operating mechanism. It adopts the self-energy arc extinction principle and features a single-break structure. The three poles of each circuit breaker are mounted on a single frame and are mechanically interconnected through a drive mechanism. The electrical control allows for both remote and local operation.

Main Technical Parameters of Circuit Breakers

Parameter NameUnitLW36-72.5LW25-126/145LW25-252LW15B-252
LW15-252
Rated voltagekV66126 / 145252252
Rated frequencyHz50505050
Rated currentA1250, 3150, 40002000, 315040003150, 4000
Rated breaking currentkA25, 31.540 / 31.54050
Rated closing current (peak)kA80100 / 80100125
Rated short-time withstand current (4s)kA31.540 / 31.54050
Rated peak withstand currentkA80100 / 80100125
Near fault breaking currentkA90% lk,
75% lk
Rated out-of-step breaking currentkA25% lk
Creepage distancecm/kV3.12.5, 3.1
1-min power frequency withstand voltage (dry test)




– To groundkV160275460460
– Inter-polekV160275
– FracturekV160 + 42275395 + 145395 + 145
1-min power frequency withstand voltage (wet test)




– To groundkV160275460460
– Inter-polekV160275
– FracturekV410650 / 750950 + 206950 + 206
Rated lightning impulse withstand voltage




– To groundkV350550 / 65010501050
– Inter-polekV350550 / 650
5-min zero-pressure withstand voltagekV8495 / 124189189
Closing timems≤150≤150≤110≤100
Opening timems≤30≤30 (reclosing ≤35)≤30≤25
Breaking timems≤60≤60≤60≤60
Closing-Opening timems40-6040-6050-7040-60
Phase asynchronism timems≤2 (open), ≤4 (close)≤2 (open), ≤4 (close)≤2 (open)≤2 (open)
Rated reclosing sequenceO—0.3s—CO—180s—COO—0.3s—CO—180s—CO
SF6 gas rated pressureMPa0.5 / 0.40.50.60.6
SF6 gas alarm/lock pressureMPa0.45/0.40, 0.35/0.300.45/0.400.55/0.500.55/0.50
SF6 gas annual leakage rate%/Year≤0.5≤0.5≤0.5≤0.5
Number of fractures per pole1111
Mechanical lifeTimes3000300030003000
Terminal mechanical strength




– Horizontal longitudinal tensionN790125015001500
– Horizontal lateral tensionN75075010001000
– Vertical tensionN750100012501250
Main circuit resistanceμΩ≤50≤45≤45≤42
Matching mechanismSpringSpringSpring/
Hydraulic
Hydraulic/
Pneumatic
SF6 gas weight per unitkg463030
Circuit breaker weightkg1000140035004000 / 4500
Standards complianceGB/T 1984, IEC 60056GB/T 1984, IEC 60056GB/T 1984GB/T 1984


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Phone: +8613736779975

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Address: 66 Punan Road, Yueqing Economic Development Zone, Zhejiang, China

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