Generator circuit-breaker VD4G-50 up to 50 kA


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Cost-optimized solutions for generators up to 70 MW

VD4G-50 is a generator circuit-breaker (GCB) with vacuum interrupting technology for short circuit currents up to 50 kA, 15 kV and rated currents up to 3,150 A with natural cooling (4,000 A with forced cooling) suitable for generators up to 70 MW.

Based on the well-proven and highly reliable VD4 platform with over one million installations since 1986, the VD4G-50 is tested to meet the most stringent IEEE and IEC requirements for generator applications as per IEEE C37.013 and the new revision IEC/IEEE 62271-C37-013, the only standards for GCB worldwide.

VD4G-50 is capable of interrupting currents with delayed zero crossings that may occur in the event of faults that are fed from the generator, or faults during synchronization with the high-voltage grid. Its interrupting technology enables withstand severe transient recovery voltages (TRV) to protect critical equipment. It has excellent duty in terms of maximum number of switching operations and is maintenance free. With its compact dimensions, VD4G-50 is suitable for installation in standard medium-voltage switchgear for the most cost-optimized solution. 


Brief performance data

Rated maximum voltage [kV]
Rated frequency [Hz]
50 / 60
Rated power frequency withstand voltage [kV]
up to 38 
Rated lightning impulse withstand voltage [kV]
up to 95 
Rated current [A]
3150 / 4000 (*)
Rated short-circuit breaking current [kA]


Why ABB?

  • The only manufacturer to provide GCB for power plant up to 2,000 MW
  • Fully tested according to IEC/IEEE 62271-C37-013, the global GCB standard
  • Longest experience in design and manufacturing of circuit-breakers for industrial and power generation applications
  • Full ABB support for suitability analysis and proper selection of GCB
  • Safe, reliable and economical solution


Specificatii Tehnice

Disponibilitate N/A
Livrare N/A
Fisa tehnica N/A

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