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What is the Derating factor to be considered when Masterpact 4 Pole breaker is used in AC Application with 2 Pole coonected in parrallel

Derating factor to be considered: 

For Two poles in parallel when used in AC Application

-Reduction factor of carrying current: 0,9 (each pole can carry 0,9 In, not In)

-Breaker Current Carrying Capacity; 1,8 x In (instead of 2 x In)
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