This document stipulates the test conditions, equipment requirements and specific test methods for the temperature derating coefficient of circuit breakers, and establishes the relationship between the temperature rise of the circuit breaker terminals and the operating current and the relationship between the ambient temperature and the operating current. This document is applicable to circuit breakers with an electronic release in a DC 1500V circuit where the main contact is used to connect the rated voltage not exceeding 1000V AC (refer to circuit breakers above 1000V AC but not exceeding 1500V) or DC 1500V. For other circuit breakers You can also refer to this document.
T/CEEIA 548-2021 history
2021T/CEEIA 548-2021 Guide for the application of low-voltage circuit-breakers—Part 1: temperature deratings