What is the maximum allowable temperature on the terminals of a MTZ ACB?

[Gregoire_Brun · Accepted solution]

hello @cdurand 

this point is define on the IEC 60-947-1 

On a Brand new product, for silver contact (case of MTZ) maximum temperature on terminals is 110°C maximum.

[RJ-Rahul]

Could you please confirm the maximum permissible temperature at the terminals for your switch disconnectors (specifically NSX 400NA) and miniature circuit breakers (MCBs) under normal operating conditions?
I noticed that the ambient air temperature for operation is specified as a maximum of 70 °C for the switch disconnector. Does this imply that the incoming cable to this device need be downrated to operate at 70 °C?
Additionally, are there any links or guidance documents that outline the maximum terminal temperature for protective devices?