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.
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 = 1000A