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ABB DO630 3BHT300007R1 NEW Output module
For installations carried out at altitudes of more than 2000 m above sea level,
the performance of low voltage circuit-breakers is subject to a decline.
Basically there are two main phenomena:
• the reduction of air density causes a lower efficiency in heat transfer. The
allowable heating conditions for the various parts of the circuit-breaker can
only be followed if the value of the rated uninterrupted current is decreased;
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