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Kindly confirm whether NW 08 HA unprotected  ACB - 4P,  is available suitable for 50DegC ambient IP42

Kindly find attached temperature derating tables for the power connections for Materpact breakers and switch disconnectors ,which indicates the maximum current rating at connection for different temperature values.

Regarding the degree of protection,you can find attached derating values when mounted in switchboards with IP31(ventilated) and IP54 (non ventilated)and at temperature 35,45 and 55 degree.

Please note that the device installed free standing has a degree of protection IP30,you can increase it to IP 40 by using Escutcheon CDP, and to IP54 by using Transparent cover CCP for escutcheon,as illustrated in the attached catalog page.
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