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The SF6 gas circuit breaker has become the backbone of modern high-voltage transmission networks due to its outstanding dielectric strength and self-healing arc quenching capabilities. Our product line at 126 kV embodies these advantages with a compact footprint and minimal environmental footprint. We offer a comprehensive selection of models to suit diverse installation requirements: the 126KV SF6 Circuit Breaker delivers reliable switching for urban substations, the 126kV Outdoor SF6 Breaker is engineered for longevity under severe climatic conditions, the 126KV High Voltage SF6 Circuit Breaker meets the most demanding short-circuit duties, and the field-proven LW36-126 SF6 Circuit Breaker combines decades of operational feedback with robust mechanical design. Each unit undergoes rigorous type testing according to IEC 62271-100 and is equipped with an optimized puffer-type interrupting mechanism. Whether deployed in new infrastructure or as a retrofit solution, our 126 kV SF6 breakers ensure grid stability and operator safety with sealed-for-life gas systems and low-maintenance operating drives.
The SF6 Gas Circuit Breaker applies self-generated pressure via a puffer cylinder linked to the moving contact assembly. During an opening operation, the cylinder moves upward, compressing SF6 gas into the arcing region through a Teflon nozzle. The gas stream cools the arc column, and as the current passes zero, the rapid rise of dielectric strength prevents re-ignition. This simple yet effective principle ensures reliable interruption of both inductive and capacitive loads without generating dangerous overvoltages. The interrupter housing is cast from aluminum alloy and treated for corrosion resistance, while all linkage points are sealed with O-rings and tested to meet IP55 standards for outdoor installation. The SF6 Gas Circuit Breaker is offered in both live-tank and dead-tank configurations. The live-tank design optimizes insulation and reduces SF6 volume, while the dead-tank arrangement facilitates integrated current transformers for metering and protection. A modular spring operating mechanism uses a motor to charge a closing spring, reducing auxiliary power requirements; an optional hydraulic mechanism can be specified for higher operating forces in extremely cold environments.
Key technical specifications of the SF6 Gas Circuit Breaker are summarized in the table below, while the subsequent list highlights the structural advantages that set this product apart.
| Parameter | Specification |
|---|---|
| Rated Voltage | 126 kV |
| Rated Current | 2000 A (630 A – 3150 A optional) |
| Rated Short-circuit Breaking Current | 40 kA |
| Rated Short-time Withstand Current (3 s) | 40 kA |
| Rated Frequency | 50 / 60 Hz |
| Rated SF6 Gas Pressure at 20 °C | 0.5 MPa (gauge) |
| Closing Time | ≤ 150 ms |
| Opening Time | ≤ 40 ms |
| Mechanical Endurance Class | M2 (10,000 CO cycles) |
| Electrical Endurance at Full Fault Current | 20 interruptions |
| Control Voltage | 110 / 220 V DC |
| Auxiliary Voltage | AC 220 V / DC 110 V |
| Ambient Temperature Range | -40 °C to +50 °C |
| Creepage Distance | ≥ 25 mm/kV (heavy pollution) |
The SF6 Gas Circuit Breaker requires minimal onsite intervention thanks to its modular drive unit and sealed interrupter. Routine checks are limited to visual inspection of gas pressure, auxiliary switch contacts, and operating counter. Factory testing includes power frequency withstand, partial discharge measurement, and gas leakage analysis according to IEC 62271-100. With proper installation, the SF6 Gas Circuit Breaker delivers more than 30 years of dependable service. It has been successfully deployed in more than 50 countries, supporting renewable integration projects, railway electrification, and heavy industrial networks. From order placement to commissioning, every unit is backed by comprehensive technical support and a global spare parts network.
