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22. Inspection and Maintenance
An after-sale service person approved by Mitsubishi Electric inspects and maintains the products. Contact
information is listed on the last page of this manual. Please check it and request inspection. When you inspect
and maintain the products, read thoroughly section 22.3 Inspection Details.
22.1 Guidances for Inspection and Maintenance
Inspection
:
The circuit breakers are inspected to detect part that may be deteriorating at an early stage,
resulting in maintaining the performance of the circuit breaker through timely renewal of
consumable and deteriorating parts and preventing accidents that could otherwise arise as the
circuit breaker approaches the end of lifetime.
Maintenance:
Regular maintenance such as grease lubrication, as-needed replacement of component and so
on, is necessary in order to maintain the performance of the circuit breaker.
22.1.1 Guidances for Inspection and Replacement according to the period of use and the usage environment
It is recommended that periodic inspections are performed about once a month commencing use thereafter
according to the guidelines for inspection, maintenance and renewal to ensure a stable, long-term use of the
circuit breaker.
Environments
Normal
Indoor where there is no
service
corrosive gas and little dust.
condition
Locations with especially
service corrosive gas and dust
Adverse
conditions and where humans
environment
cannot stay for a long period
of time.
22.1.2 Guidances for Inspection and Replacement according to the number of operating cycles
Number of operating
Model
cycles with current
(Note 1)
AED630-CV
AED1000-CV
AED1250-CV
AED1600-CV
(Note 1) Operating cycles shall be regarded as being with rated current, even if the current is much less than the maximum rated current
of the circuit breaker.
(Note 2) When an after-sale service person approved by Mitsubishi Electric inspects and maintains the products according to the period
of use and usage environment
E-46
Distribution panels in dividual
electrical rooms that are not
dustproof and air-conditioned.
Geothermal power plants, sewage
(treatment) plant, steel works, paper
factories, pulp factories. Chemical
factories, quarries, mining areas, etc.
Guidances for inspection
Number of operating
cycles without
current
Every 500 cycles
Every 2,000 cycles
Guidances for
Specific examples
Product performance
Limit of number of operating cycles
(Note 2)
With
Without
current
current
6,000
4,000
Guidances for
inspection
maintenance
Once every
Once every
2 to 3 years
2 inspection
Once every
Once a year
half year
Limit of number of operating cycles
with overload current
Total
Current
operating cycles
6 times the rated
10,000
current
Guidances for
replacement
Within approx.
7 to 15 years
Within approx.
1 to 3 years
Number of
12 cycles
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