Dear Efim Sturov,

I suggest for you to check the following standards:

IEEE Std C37.13a-2012 - IEEE Standard for Low-Voltage AC Power Circuit

Breakers Used in Enclosures Amendment 1: Increase of Voltages to 1000 V

AC and Below.

IEEE Std C37.17-2012 - IEEE Standard for Trip Systems for Low-Voltage (1000 V and below) AC and General Purpose (1500 V and below) DC Power Circuit Breakers.

The last one includes minimum requirements for available settings and time delay characteristics as well as operational and calibration requirements.

Best regards,

Dear Youcef,

Appreciate your help. Thank you.

Best Regards

You are welcome Efim Sturov.