South Korea: Hyosung Heavy Industries has announced the development of the country’s first next-generation 145 kV circuit breaker that does not rely on sulfur hexafluoride (SF₆), a gas known for its high global warming impact. The company said it will now move into mass production.
The new design replaces SF₆, traditionally used for insulation and arc suppression, with dry air made up of nitrogen and oxygen. Combined with vacuum circuit breaker technology, the system removes greenhouse gas emissions while maintaining strong insulation performance and reliable current interruption.
Hyosung stated it is the first company in South Korea to apply both dry air and vacuum interruption to a 145 kV-class breaker. Under standards set by the Short-Circuit Testing Liaison, the technology has been recognised as the second certified example of its kind globally.
With the European Union tightening rules on fluorinated greenhouse gases, demand for alternatives to SF₆ is increasing across the power sector. Market estimates suggest the sector could grow from $5.4 B in 2024 to over $7.4 B by 2033.
Building on this launch, Hyosung plans to expand its range of SF₆-free circuit breakers into higher voltage levels. The company aims to strengthen its position in the growing market for environmentally friendly power equipment, driven by stricter regulations and the need to modernise ageing infrastructure.
Source: Maeil Business
