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1. INTRODUCTION
Mitsubishi Advancing Technology
Mitsubishi, the leading manufacturer of circuit break-
ers, has been providing customers with a wide range
of highly reliable and safe moulded case circuit break-
ers (MCCB) and earth-leakage circuit breakers
(ELCB), corresponding to the needs of the age.
Since production began in 1933 many millions of
Mitsubishi ACBs, MCCBs and MCBs have been sold
throughout many countries.
In 1985 a new design concept for controlling arc en-
ergies within MCCBs – vapour jet control (VJC) – was
introduced and significantly improved performance. It
is provided the technological advance for a new ‘su-
per series’ range of MCCBs and is used in all present
ratings from 3 to 1600 amps.
In 1995 Mitsubishi offers the new PSS (Progressive
Super Series) breakers having ratings from 3 to 250
amps that concentrate the most advanced technolo-
gies into a compact body. Their four major features
are:
• New circuit-breaking technology ISTAC for a higher
current-limiting performance, upgrading the circuit-
breaking capability.
• Electronic circuit breakers with the Digital ETR pro-
tecting the circuit accurately.
• One-frame, one-size design allowing efficient panel
design.
• Cassette-type internal accessories that allow instal-
lation by the user.
Progressive Super Series, an integration of technol-
ogy and know-how from this comprehensive electronic
product manufacturer, will create its own fields of ap-
plication with its excellent performance.
A Brief Chronology
1933 Moulded case circuit breaker production
begins.
1952 Miniature circuit breaker production be-
gins.
1968 Manufacture commences of short-time-
delayed breakers.
1969 Production and sale of first residual cur-
rent circuit breakers.
1970 170kA breaking level ‘permanent power
fuse’ integrated MCCBs is introduced.
1973 Introduction of first short-time delay and
current-limiting selectable breakers go on
sale.
1974 First MELNIC solid-state electronic trip
unit MCCBs are introduced.
1975 ELCBs with solid-state integrated circuit
sensing devices are introduced.
1977-1979 Four new ranges of MCCBs are intro-
duced – economy, standard, current lim-
iting, ultra current limiting and motor rated
designs – a comprehensive coverage of
most application requirements.
1982 Compact ACBs with solid-state trip de-
vices and internally mounted accessories
introduced.
1985-1989 Super series MCCBs with VJC and ETR
are developed and launched – awarded
the prestigious Japanese MInister of Con-
struction Prize.
1990 New 200kA level U-series MCCBs super
current limiting breakers are introduced.
1991 Super-NV ELCBs and Super-AE ACBs
are introduced.
1995 Progressive Super Series 30~250 amps
are introduced.
1997 Progressive Super Series 400~800 amps
are introduced.
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