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EconiQ™ gas-insulated switchgear (GIS) ELK-04, 145 kV

Eco-efficient modular GIS solution for reliable energy supply

The EconiQ ELK-04, 145 kV is the most robust SF6-free gas-insulated switchgear (GIS). It combines a low carbon footprint, superior reliability, and low life cycle costs in a flexible product layout.

It is a sustainable and eco-efficient switchgear that has proven capabilities to reduce the CO2 equivalent (CO2 eq) emissions during the complete life cycle of the product, compared to conventional SF6 and other SF6-free technologies.

EconiQ ELK-04, 145 kV uses a gas-mixture of carbon dioxide (CO2), oxygen (O2) and small amounts of fluoronitrile (C4-FN) that delivers significantly lower life cycle assessment (LCA) ratings over the lifetime of the equipment.

The eco-efficient equipment is based on the solid legacy of ELK-04, 145 kV, which has the largest installed base of any sub-transmission GIS in the world. It uses the same proven gas-circuit breaker technology that has been utilized for decades in transmission systems.

EconiQ is Hitachi Energy’s eco-efficient portfolio for sustainability where products, services and solutions are proven to deliver exceptional environmental performance.


  • Power transmission
  • Integration of renewable power generation units to the grid
  • Offshore and onshore wind power connections

Why Hitachi Energy?

  • Most reliable eco-efficient GIS solution in the market
  • Exceptional engineering design
  • Based on well-proven and reliable gas circuit breaker technology

Benefits of the eco-efficient technology

  • No risk of accidental leakage of SF6
  • Excellent environmental performance due to the minimum use of material
EconiQ™ GIS ELK-04, 145 kV

Brief performance data

EconiQ GIS ELK-04, 145 kV  
Rated voltage [kV] 145
Rated short-duration power-frequency withstand voltage [kV] 275
Rated short-duration power-frequency withstand voltage across [kV] 315
Rated lightning impulse withstand voltage [kV] 650
Rated lightning impulse withstand voltage across isolating distance [kV] 750
Rated normal current [A] 3150
Rated short-time withstand current [kA] 40
Rated peak withstand current [kA] 108
Rated operating sequence O-CO-CO

Downloads for EconiQ ELK-04, 145 kV

EconiQ ELK-04, 145 kV

2-pages, product flyer

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