Brochure

PowerPact H-, J-, and L-Frame Circuit Breakers
Trip Curves
241
02/2016
© 2011–2016 Schneider Electric
All Rights Reserved
Figure 118: Micrologic 3.3, 3.3-W, 3.3S, and 3.3S-W Electronic Trip Unit Instantaneous Trip Curve
MICROLOGIC™ ELECTRONIC TRIP UNITS
Micrologic™ 3.3, 3.3-W, 3.3S, and 3.3S-W
Instantaneous Trip Curve
250A L-Frame
The time-current curve information is to be used
for application and coordination purposes only.
Notes:
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 20
minutes is required between overloads to
completely reset thermal-imaging.
2. Total clearing times shown include the
response times of the trip unit, the circuit
breaker opening, and the extinction of the
current.
3. In = Maximum dial setting of Ir.
250A L-Frame: In = 250A = Max Ir setting
Curves apply from -35ºC to +70ºC (-31ºF to
+158ºF) ambient temperature.