# Siemens Energy India Energizes First 145 kV SF6-Free "Blue" Circuit Breaker with Clean-Air Vacuum Technology in Goa

> Siemens Energy India, in collaboration with the Goa Electricity Department, has successfully energized the country’s first 145 kV SF6-free transmission circuit breaker, utilizing purified clean air insulation and vacuum interrupters.

- **Publish Date:** 2026-09-21
- **Category:** transformers-grid
- **Reading Time:** 4 min
- **Original Source Citation:** [Siemens Energy India & Goa Electricity Department](https://www.siemens-energy.com/in/en/home/press-releases/first-145kv-sf6-free-blue-circuit-breaker-commissioning-goa.html)
- **Tags:** Siemens Energy, SF6-Free, Blue Circuit Breaker, 145 kV, Clean Air, India, Substations
- **Canonical URL:** https://voltformer.com/news/siemens-energy-india-commissions-first-145kv-sf6-free-blue-breaker-goa
- **Markdown Source:** https://voltformer.com/news/siemens-energy-india-commissions-first-145kv-sf6-free-blue-breaker-goa.md

## Zero Global Warming Gas in High-Voltage Substations

Installed at the 220/110/33 kV Kadamba substation in Goa, the 145 kV "Blue Circuit Breaker" replaces conventional sulfur hexafluoride (SF6)—a potent greenhouse gas with a global warming potential 24,300 times that of CO2—with a natural gas mixture of 80% nitrogen and 20% oxygen.

Arc extinguishing is handled by hermetically sealed vacuum interrupter bottles rated for 40 kA short-circuit interruption, eliminating F-gas emissions and regulatory leak monitoring requirements entirely.

## Tropical Resiliency and Low Lifecycle Operating Costs

The switchgear proved immune to tropical coastal humidity and corrosion during intensive pre-commissioning evaluations, requiring zero gas handling certifications for local utility crews.

The project demonstrates that India’s ambitious grid modernization roadmap can embrace clean-air transmission assets without compromising reliability.

---
Related: [Power & Energy News Hub](https://voltformer.com/news.md) · [Voltformer Substation & Transformer Catalog](https://voltformer.com/catalog.md)