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Mitsubishi Electric produces one millionth medium-voltage circuit breaker

Mitsubishi Electric announced today that the company’s Power Distribution Systems Center (PDSC) has produced its milestone one millionth medium-voltage circuit breaker in Marugame, Kagawa Prefecture, Japan in March. Medium-voltage circuit breakers protect electric facilities and power distribution networks in buildings, factories and other industrial facilities by cutting off irregular current in the case of accidents such as lightning strikes to power networks.

Going forward, Mitsubishi Electric will continue to contribute to the safety and stability of power systems by developing and commercializing electricity technology for advanced industrialization and environmental protection, including the reduced use of hazardous substances based on RoHS standards.
Milestones in PDSC’s Production of Medium-voltage Circuit Breakers
1979 Marugame factory established and begins producing circuit breakers
1982 7.2kV VF-A series vacuum circuit breaker shipments begin
1991 12kV-80kA high-function gas circuit breaker shipments begin
1999 7.2kV high-speed vacuum circuit breaker shipments begin
2000 Cumulative production reaches 500,000 units
2004 7.2kV-type VF-D series vacuum circuit breaker shipments begin
2013 72/84kV dead-tank vacuum circuit breaker shipments begin.

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