With short-circuit ratings from 170 to 210 kA, HEC 7/8 is suitable for power plants up to 1,600 MW and is recommended for retrofits or replacements of old generator circuit-breakers (GCBs) in air-blast technology. Naturally cooled up to 25,000 A, its interrupting technology allows to clear fault currents exhibiting very high degree of asymmetry up to 120-130 percent.
The 3-phase system includes circuit-breaker, disconnector, capacitors and control cubicle, and offers a wide selection of additional components, such as earthing and starting switches, current and voltage transformers and surge arresters. It is delivered fully assembled to minimize the installation and commissioning time at site.