Micrologic 5.0/6.0 A/P/H Trip Unit
Micrologic 5.0/6.0 A/P/H Trip Units
Characteristic Trip Curve No. 613-4
Long-Time Pickup and Delay
Short-Time Pickup and I
2
t OFF Delay
The time-current curve information is to be used for
application and coordination purposes only.
Curves apply from -30°C to +60°C (-22°F to +140°F)
ambient temperature.
NOTE:
1. There is a thermal-imaging effect that can act to
shorten the long-time delay. The thermal-imaging
effect comes into play if a current above the long-
time delay pickup value exists for a time and then is
cleared by the tripping of a downstream device or
the circuit breaker itself. A subsequent overload will
cause the circuit breaker to trip in a shorter time than
normal. The amount of time delay reduction is
inverse to the amount of time that has elapsed since
the previous overload. Approximately twenty
minutes is required between overloads to completely
reset thermal-imaging.
2. The end of the curve is determined by the
interrupting rating of the circuit breaker.
3. With zone-selective interlocking ON, short-time
delay utilized, and no restraining signal, the
maximum unrestrained short-time delay time band
applies regardless of the setting.
4. Total clearing times shown include the response
times of the trip unit, the circuit breaker opening, and
the extinction of the current.
5. For a withstand circuit breaker, instantaneous can
be turned OFF. See trip curve 613-7 for
instantaneous trip curve. See trip curve 613-10 for
instantaneous override values.
6. Overload indicator illuminates at 100%.
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