LW36-126 126kV SF6 Gas Circuit Breaker

LW-126 type outdoor high voltage alternating current sulfur hexafluoride circuit breaker (hereinafter referred to as the circuit breaker) is a kind of outdoor high-voltage switchgear equipment with three poles AC SOHzand it adopts SF6 gas as arc extinguishing and insulation medium. It can be used for the separation and combination of rated current and fault current, capacitor bank, and switching circuit, and it can also be used as aninterconnecting breaker so as to realize the control and protection of transmission lines and equipment, especially suitable for frequent operation.The circuit breaker is equipped with CT20 type spring operation mechanism.

This circuit breaker complies with the requirements of IEC 62271-100.

Model Explanation

• LW: Outdoor SF6 circuit breaker
• 36: Design serial number
• 126: Rated voltage (126kV)
• /3150: Rated current (3150A)
• -40: Rated short-circuit breaking current (40kA)

Structural Features

• 3-phase porcelain column, single-break structure, with a central spring mechanism for 3-phase linkage.
• Self-energy arc extinguishing (thermal expansion + auxiliary blowing), low energy consumption, short arcing time, and long electrical life.
• SF6 gas as both insulating and arc-extinguishing medium, non-flammable, explosion-proof, and safe for densely populated areas.
• Density relay monitors SF6 pressure in real time to ensure operational reliability.
• Compact design, small footprint, and long maintenance-free intervals.

Application Scope

• Outdoor substations for 110kV transmission and distribution systems.
• Power grid interconnections as tie breakers.
• Areas with high altitude (≤2000m, customizable for 3000m) and heavy pollution (Class IV).
• Ambient temperature: -30°C to +40°C (-40°C to +40°C for low-temperature models).

Key Advantages

• High reliability: Proven self-energy arc extinguishing technology, stable performance under extreme conditions.
• Low noise: Spring mechanism reduces operating noise, suitable for urban areas.
• Easy maintenance: Simple structure, no oil, minimal maintenance workload.
• Import substitution: Fully replaces foreign-made 110kV SF6 breakers with lower cost.

Technical Parameters

Rated Insulation Level

Main Mechanical Characteristics

Drawing