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    What is the altitude derating for a TeSys D-Line contactor?

    Issue:​
    What is the altitude derating for a TeSys D-Line contactor?

    Product Line:
    Digest 177 Section 18 : Contactors and Starters, IEC

    Environment:
    North American Products

    Resolution:
    The contactors are fully rated up to 3000 meters. Following are derating multipliers for altitudes above 3000 meters for both voltage and current:

    Voltage
    3500m x 0.90
    4000m x 0.80
    4500m x 0.70
    5000m x 0.60

    Current
    3500m x 0.92
    4000m x 0.90
    4500m x 0.88
    5000m x 0.86

    For example, an LC1D80 at 5000 meters:
    - The maximum rated operational voltage is 1,000V (IEC947-4) and 690V (UL/CSA). At 5000 meters it becomes 1000V x 0.6 = 600V (IEC947-4) and 690V x 0.6 = 414V (UL/CSA).
    - The maximum rated operational AC3 current is 80A. At 5000 meters it becomes 80A x 0.86 = 68A.



     

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