HEC 9 has been developed as a system for large-sized power plants such as nuclear, coal-fired and hydropower plants. It has the world's highest performance with short-circuit currents up to 300 kA and it is also highly suitable for retrofits or replacements of old GCBs in air-blast technology.
Based on Hitachi Energy's well-proven and highly reliable SF6 technology, it enables lower lifecycle costs and gives a time-to-overhaul period of up to 20 years.
It is delivered in single-phase systems to facilitate the transportation and installation with plug-in design to minimize the activities at the site. Besides circuit-breaker, disconnector, capacitors and control cubicle, it also includes a wide selection of additional components such as earthing and starting switches, current and voltage transformers and surge arresters.