Would you believe a circuit breaker does not always trip at the same tripping point!
There are various reasons a circuit breaker tripping point deviates…one is temperature.
Well for some more then others – the thermal-based ones have big deviation, it even gets affected by the neighbors.(grouping) as well as the frequency of the supply.
It is for this reason the code does special allowance for “non-temperature compensated circuit breakers”.
The bottom line is the higher the temperature the lower the tripping point moves – and vice versa of course.
Surprisingly it gets worse…even using circuit breakers next to one another – called grouping- one also has to derate them because of the thermal effects on one another.
And just for the sake being holistic: If ever you do consider using a circuit breaker at frequencies higher then 60Hz…think again.
Ciruit Breaker tripping point deviation due to temperature
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