Modeling the thermal part of the time current curve

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1 May 2019
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G’ day,

I am working on designing protection devices for my research work and I am struggling to model the thermal part for the low voltage circuit breakers based on IEC standards.

Based on the standards, the time current curve for types B, C and D are as mentioned on the attached figure. I could not find the proper formula which represents the thermal characteristic for these types. Please, assist on this matter.

Thank you for your cooperation in advance.
YjxLtYK
 

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