The derating table (attached) for the iC60 devices are based on testing with respect to IEC 60898-1 and IEC 60947-2 requirements.

Standard IEC 60898-1:

• Testing is to be done at temperature reference 30°C
• Conventional non-tripping current 1.13 x In
• Conventional tripping current 1.45 x In
• Conventional time 1h

 
Standard IEC 60947-2:

• Conventional non-tripping current 1.05 x In
• Conventional tripping current 1.3 x In
• Conventional time 1h
• Each manufacturer defines the ambient reference temperature.

50°C for MCB compliant with both standards (IEC 60898-1 and IEC 60947-2)
40°C for MCB compliant only with IEC 60947-2
 
Furthermore, the manufacturer is responsible to include the reference temperature of the test at rated current, printed on the device as follows:

For more information concerning the 2 standards, please visit the blog:
 
https://blog.schneider-electric.com/energy-regulations/2014/02/06/iec-60898-1-iec-60947-2-tale-two-standards/

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