Mitsubishi Electric Delivers World's First SiC Auxiliary Power Supply Systems for Railcars

  Mitsubishi Electric Delivers World's First SiC Auxiliary Power Supply
  Systems for Railcars

     Will be incorporated in Type 1000 railcars of Tokyo Metro Ginza Line

Business Wire

TOKYO -- March 26, 2013

Mitsubishi Electric Corporation (TOKYO:6503) announced today that it has
commercialized and delivered railcar auxiliary power supply systems that
incorporate the world's first silicon carbide (SiC) power modules for actual
use in operating trains. Systems now being installed for test operation in new
Type 1000 railcars of Tokyo Metro's Ginza Line subway are scheduled to enter
commercial operation in June.

Auxiliary power supply systems provide electricity to air conditioners and
lighting inside railcars. Compared to Mitsubishi Electric's existing system
incorporating silicon power modules, the new system achieves 30% less power
loss, is 20% smaller and 15% lighter. It also reduces transformer noise by 4dB
due to a 35% improvement in the distortion rate of output voltage waveforms.

Compared to Si, SiC helps to reduce size and weight through lowered power loss
and higher energy efficiency, as well as smaller power module radiators.
Mitsubishi Electric has developed a variety of SiC power module applications,
including the world's first large-voltage SiC railcar inverters for
DC600V/750V power lines, which were launched in October 2011 and incorporated
in Tokyo Metro's Ginza Line Type 01 railcars in February 2012. Also, SiC
railcar inverters developed for DC1500V power lines were launched in November
2012 and installed in Tokyo Metro's Tozai Line Type 15000 railcars beginning
in January 2013.

The new SiC auxiliary power supply system incorporate technologies Mitsubishi
Electric developed for SiC inverters.

Total railway energy solutions

Mitsubishi Electric is developing total railway energy solutions for enhanced
energy management of railcars, including the new SiC auxiliary power supply
systems, as well as stations, rail yards and train lines.

About Mitsubishi Electric

With over 90 years of experience in providing reliable, high-quality products,
Mitsubishi Electric Corporation (TOKYO:6503) is a recognized world leader in
the manufacture, marketing and sales of electrical and electronic equipment
used in information processing and communications, space development and
satellite communications, consumer electronics, industrial technology, energy,
transportation and building equipment. Embracing the spirit of its corporate
statement, Changes for the Better, and its environmental statement, Eco
Changes, Mitsubishi Electric endeavors to be a global, leading green company,
enriching society with technology. The company recorded consolidated group
sales of 3,639.4 billion yen (US$ 44.4 billion*) in the fiscal year ended
March 31, 2012. For more information visit

*At an exchange rate of 82 yen to the US dollar, the rate given by the Tokyo
Foreign Exchange Market on March 31, 2012


Mitsubishi Electric Corporation
Customer Inquiries
Railway Transportation
Media Inquiries
Yurika Fujimoto, +81-3-3218-3380
Public Relations Division
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