4
■ Normal service conditions
If under ordinary conditions the following normal working conditions are all satisfied, MCCB
should be used under this condition unless otherwise specified..
1) Ambient temperature
A range of max. +40℃to min. -5℃ is recommended. However, the average temperature of 24
hours does not exceed +35℃.
2) Altitude : 2,000m or less.
3) Environmental conditions
The air must be clean, and the relative humidity does not exceed 85% at a max. of +40℃
and 90% at 20℃. Do not use and store in presence of corrosive or ammonia gas.
(H2S ≤ 0.01ppm, SO2 ≤ 0.01ppm, NH3 ≤ a few ppm)
4) Installation conditions: When installing MCCB, refer to catalogue or the installation
instructions in the instruction manual.
5) Storage temperature : A range of max. +60℃ to min. -20℃ is recommended.
6) Replacement : Approx. 15 years (depends on number of breaking of over current or service
condition. Please see maintenance and inspection for further detail.
■ Special service conditions
In the case of special service condition, modified air circuit breakers are available. Please specify
when ordering. Service life may be shorter, it depends on service conditions.
1) Special environmental conditions
If it is used at high temperature and/or high humidity, the insulation durability and other
electrical or mechanical features may deteriorate. Therefore, the breaker should be specially
treated. Moisture fungus treatment with increased corrosion-resistance is recommended.
When using products under this condition, please contact LS service team or nearest sales
representatives.
2) Special ambient temperature
If the ambient temperature exceeds +40℃, reduce the continuous conducting current for
a use referring to Table. A.
3) Special altitude
If it is used at the 2,000m or higher the heat radiation rate is reduced and the operating voltage,
continuous current capacity and breaking capacity are decreased. Moreover the durability
of the insulation is also decreased owing to the atmospheric pressure.
B. Service condition
1. Normal/Special service condition
Table A. The compensation of rated current according to ambient temperature
Type
Rated
Current
Bus
Applicable
Standards
Ambient temperature (℃)
40 45 50 55 60
TS1000N/H/L
800A 5tX50X2ea 800A 800A 800A 800A 800A
1000A 5tX60X2ea 1000A 1000A 1000A 1000A 1000A
TS1250N/H 1250A 5tX80X2ea 1250A 1250A 1250A 1250A 1250A
TS1600N/H 1600A 5tX100X2ea 1600A 1600A 1560A 1510A 1470A
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