Derating for Installation in altitude

For site altitudes of more than 2500 m above sea level the following reductions apply:
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Site altitude 2500 m above sea level:
- Reduction of rated insulation voltage to 0,93 x Ui
- Reduction of load current to 0,93 x Ie
- Setting of load current in thermally delayed overcurrent protection devices to 1,02 x Ie
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Site altitude 3000 m above sea level:
- Reduction of rated insulation voltage to 0,88 x Ui
- Reduction of load current to 0,9 x Ie
- Setting of load current in thermally delayed overcurrent protection devices to 1,05 x Ie
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Site altitude 4000 m above sea level:
- Reduction of rated insulation voltage to 0,79 x Ui
- Reduction of load current to 0,8 x Ie
- Setting of load current in thermally delayed overcurrent protection devices to 1,1 x Ie
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Site altitude 5000 m above sea level:
- Reduction of rated insulation voltage to 0,75 x Ui
- Reduction of load current to 0,7 x Ie
- Setting of load current in thermally delayed overcurrent protection devices to 1,15 x Ie
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These ratings apply to a maximum ambient temperature of 40 °C.

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IMPORTANT NOTE: Due to the influence of ambient pressure,
these altitudes are not suitable for vacuum switchgear!
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