What are Fundamental characteristics of a Circuit Breakers?

Operating Voltage (Ue)
It is the voltage at which any circuit breaker is designed under normal conditions.

Rated current (In)
This is the maximum value of current that a circuit-breaker, can carry indefinitely at an ambient temperature designed by the manufacturer, without any interruption.


Overload Trip (Ir) Setting:

It is used for the continuous ampere rating according to current. It has different set of multiples in the adjustable knob ranging from 0.4 to 1 of nominal or rated current of circuit breaker which can be represented by In.

Overload Ir setting of a Circuit Breaker
Overload Ir setting of a Circuit Breaker


Ir= multiple *In.
Let suppose we have a circuit breaker having rating of 2000 A which has a current load of 1000A so we will set it 1000A by moving the knob at 0.5 which means
Ir= 0.5*2000
Ir = 1000A

Asif Malik

A young Electrical Engineer having more than 5 years of experience in Electrical Power System, Construction and Execution of different projects, Project Management, Electrical Inspection. He is a article Writer as well on the different topic related to Electrical Engineering and Information Technology.

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