MITSUBISHI ELECTRIC CORPORATIONPUBLIC RELATIONS DIVISION
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No. 3432

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Mitsubishi Electric Corporation
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Notice Regarding Third Party Certification Periodic Inspection for
Mitsubishi Electric UL 489 Listed Low-Voltage Circuit Breakers
TOKYO, September 1, 2021 – Mitsubishi Electric Corporation (TOKYO:6503) announced today thatinternal investigations have revealed that its UL489-listed low-voltage circuit breakers, used mainly inmachinery and manufactured at the company’s Fukuyama Works in Fukuyama, Hiroshima Prefecture,underwent follow-up periodic factory inspections by Underwriters Laboratories (UL), a third-party safetyscience organization in the United States using samples different from actual mass-produced products.
Additionally, during certain tests for circuit breakers, the voltage used was lower than that specified by UL.
Mitsubishi Electric has confirmed that the inspections, depending on the model, were carried out starting inaround 2005.
As soon as the situation was revealed, Mitsubishi Electric halted shipments of the products in question andreported the matter to UL. Concurrently, Mitsubishi Electric used samples of actual mass-produced products
and conducted the same test as that specified by UL for periodic factory inspections and confirmed compliancewith the UL standard. Approval was subseqently received from UL and shipments were sequentially resumed
from August 27.
The products in question include the following low-voltage circuit breaker models (UL 489-listed):
NF50-SMU, NF/NV100-SRU, NF/NV100-HRU, NF/NV125-SVU/HVU, NF/NV250-CVU/SVU/HVU,NF/NV400-SWU/HWU, NF630-SWU/HWU, NF/NV50-SVFU, and NF/NV100-CVFU.
An investigative committee consisting of external experts was established by Mitsubishi Electric on July 2 andthe committee is continuing its investigations. The cause of these issues and measures to prevent any
recurrence will be announced as soon as the committee issues its final report. Meanwhile, Mitsubishi Electricwill publicly announce any other serious matter, including improper testing of other products that is newly
uncovered through further investigations.
At present, Mitsubishi Electric has determined that there is no need to revise its consolidated earnings forecast
for the current fiscal year. The company, which is working sincerely with customers and implementing
necessary preventive measure, will disclose any potential impact on consolidated earnings forecast that comesto light thereafter.

###About Mitsubishi Electric Corporation
With 100 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 andelectronic equipment used in information processing and communications, space development and satellite
communications, consumer electronics, industrial technology, energy, transportation and building equipment.
Mitsubishi Electric enriches society with technology in the spirit of its “Changes for the Better.” The company
recorded a revenue of 4,191.4 billion yen (U.S.$ 37.8 billion*) in the fiscal year ended March 31, 2021. For
more information, please visit www.MitsubishiElectric.com*U.S. dollar amounts are translated from yen at the rate of ¥111=U.S.$1, the approximate rate on the Tokyo
Foreign Exchange Market on March 31, 2021

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