Name: ASNA Technology Explained: How Atmospheric Sealed Air Insulation Replaces SF₆ in MV Switchgear
Uploaded: 2026-10-19T09:29:54+08:00
Duration: 4 min 16 s
Description: With the EU F-Gas Regulation (EU) 2024/573 set to ban new SF₆ medium-voltage switchgear from 2026, utilities, EPC contractors and project owners across Europe and beyond are actively seeking reliable, fully compliant alternatives. While many manufact

With the EU F-Gas Regulation (EU) 2024/573 set to ban new SF₆ medium-voltage switchgear from 2026, utilities, EPC contractors and project owners across Europe and beyond are actively seeking reliable, fully compliant alternatives. While many manufacturers are racing to adapt to the new regulatory requirements, HM Power has been refining fluorine-free switchgear technology since 2009 — and our proprietary ASNA (Atmospheric pressure Sealed Natural-Air) insulation system stands as one of the most field-proven solutions available on the global market.

This technical deep-dive video breaks down the core principles and real-world advantages of ASNA insulation technology, and explains why it delivers superior long-term performance across diverse operating conditions.

1. Atmospheric Pressure Balance: Zero Leakage Risk & Maintenance-Free Operation

The sealed tank of ASNA switchgear maintains equal air pressure inside and outside the enclosure, with zero internal gauge pressure. This fundamental design eliminates SF₆ gas leakage risk entirely, and removes the need for routine pressure monitoring and periodic gas refilling throughout the equipment’s full 40-year design service life, significantly reducing long-term operational expenditure (OPEX).

2. Fully Sealed Enclosure: Stable Performance Across Harsh Environments

The hermetically sealed cabinet structure blocks external contaminants including dust, moisture and corrosive particles from entering the internal chamber. It ensures consistent, reliable operation across diverse harsh working conditions, ranging from high-temperature industrial parks and remote mining sites to humid coastal and tropical regions, adapting to both indoor distribution rooms and outdoor switch cabinet installations.

3. Natural Air Dielectric: Consistent Insulation Strength & Self-Healing Capability

Using natural air as the core insulation medium instead of greenhouse SF₆ gas, the system delivers stable and uniform dielectric strength over long-term operation. It also features built-in self-healing properties that allow insulation recovery after minor electrical breakdown, supporting dependable short-circuit breaking performance for distribution networks.

Inside every ASNA RMU unit, every component is meticulously engineered for peak performance: optimized electric field distribution, fully modular architecture and precision manufacturing quality. It represents an engineering philosophy of zero compromises, even for internal structures hidden from daily operation. All ASNA series units pass full KEMA type tests according to IEC 62271 international standards.

Backed by over 15 years of in-field validation and 60,000+ installations worldwide — including State Grid of China headquarters, space launch sites, the FAST Telescope and hyperscale data centers — ASNA technology is not just a short-term compliance fix for F-Gas regulations. It is a proven, long-term solution for safe, reliable and sustainable power distribution infrastructure.