Eaton EMR-3MP0 - Motor Protection Curves

4.4.1
Motor Protection Curves
multiples of FLA
t [s]
MotorStart_F05
Ultimate trip
based on % of
full-load
amperes
(100% shown)
I²T curves
(I is an effective
current including
I1 and kI2.)
Maximum allowable
stalll time
(30 sec cold start)
(15 sec cold start)
(10 sec cold start)
(5 sec cold start)
Based upon locked
rotor current of 6.1
times full-load amps
Instantaneous
overcurrent set at
12 times full-load
amperes
Instantaneous
overcurrent start
delay set for
2 cycles
Fig. 39: Motor Protection Curve (Example 1).
160 www.eaton.com EMR-3MP0
4 Protective Elements
4.4 Ultimate Trip Current