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What is M241 altitude derating?

What is M241 altitude derating?

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For altitude derating, we have no curve but only a simple computed value. 
The normal ambient allowed operating temperature range is -10...+55 °C, up to 2000m 
The altitude has an influence on 2 parameters: 

- Operating temperature: temperature derating: 1 °C/400m (should be added to every 400m after 2000m)
- Insulation loss: 150 Vdc/1000m (should be added to every 1000m after 2000m)
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