| Brand | ROCKWILL |
| Model NO. | 126kV High-voltage AC Dead tank SF6 circuit breaker |
| Rated voltage | 126kV |
| Rated normal current | 3150A |
| Rated frequency | 50/60Hz |
| Series | LW |
Description：
Outdoor 126kV High-voltage AC Dead tank SF6 circuit breaker is an outdoor - installed, three - pole, 50Hz AC high - voltage switching device that uses SF6 gas as the arc - extinguishing and insulating medium. It can be used to interrupt and close rated current and fault current, interrupt and close capacitor banks, transfer circuits, and also be used as a tie - circuit breaker to achieve the control and protection of power transmission and transformation lines and equipment. It is especially suitable for frequent operations. The circuit breaker is equipped with a spring operating mechanism.
Main Features：
The material of the contact end is copper - tungsten alloy, which has strong arc - resistance ability. Especially during the opening and closing process of the circuit breaker, an arc will be generated, and a large amount of energy acts on the arcing contacts. Therefore, the ablation - resistant material is an important guarantee for the electrical life. The large and small nozzles are made of polytetrafluoroethylene material with excellent high - temperature and arc - resistance properties and appropriate fillers.
Technical specifications：
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SF₆-Free Solution for Air-Insulated/Eco-friendly Gas Ring Main UnitsⅠ. Technical Bottlenecks of SF₆ SubstitutionInsulation Medium Performance Gapo Dried Air/N₂ insulation strength is only 1/3 of SF₆, requiring expansion of contact gap from 60mm to ≥150mm.o Conventional spring mechanisms lack energy to drive rapid closure of large gaps, easily causing contact ablation due to pre-strike.o Synthetic gases (e.g., C4+CO₂) decompose under arcing, leading to irreversible insulation degradation.Mechanical Structural Limitationso National Grid standardization fixRockwill16/08-2025 -
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Pressure Relief Safety Solution for Gas-Insulated Ring Main UnitsⅠ. Problem ContextAs a core component in urban power distribution networks, ring main units (RMUs) are widely used in residential areas, factories, and public buildings due to their compact structure, low cost, and high reliability. However, internal equipment failures or arc faults may generate high-temperature, high-pressure gas, leading to cabinet explosions that endanger personnel and equipment. While traditional sealed designs maintain insulation integrity, they fail to rapidly release sudRockwill16/08-2025
