MCB and its minimum Operating Voltage Specification

[Anonymous user]

For MCB what is the test for minimum voltage specification , because many a times we come across this question of minimum Operating Voltage for MCB? 

[Anonymous user]

@Anonymous user  - The IEC standard doesn't require any minimum voltage specification to be assigned to a circuit breaker. There are preferred values of rated voltage referred in Cl 5.3.1 of IEC 60898-1 for 1P, 2P, 3P and 4P MCBs. A manufacturer can choose to specify any of the preferred values, but the performance of the product shall be evaluated against that rated voltage, especially important for the short-circuit performance.

Regards,

Anilesh Kaduthanum

Senior Principal Project Test Leader