JSC High-Voltage Union is one of few enterprises supplying power plants in CIS-states with modern generator circuit-breakers of domestic manufacture. Nowadays circuit-breakers of 10, 15 and 20 kV rated voltage have been produced.

Vacuum circuit-breaker 10 kV of VGG-10 series represents new generation of generator commutation apparatuses and it is the first and the only apparatus of such type in CIS. The circuit-breaker is equipped with vacuum cameras by Siemens and intended to commutate generator circuits at rated currents up to 5000 A. The apparatus was developed as a retrofit and renovation for MGG-10 circuit-breaker.

Low-oil circuit-breakers 10 kV of MGG-10 series are intended for commutation 10 kV generator circuits at normal and emergency modes at rated currents up to 5600 A. The have been manufactured both for use in moderate and tropical climates.

Low-oil circuit-breakers 15 kV of VGM-15 series are intended for commutation 15 kV generator circuits at normal and emergency modes at rated currents up to 11200 A (with use of current cut-off).

Low-oil circuit-breakers 20 kV of MGU-20 series are intended for commutation 20 kV circuits at normal and emergency modes in the systems with insulated or partially grounded neutral. The apparatuses should be installed in cameras with forced air-circulation.