Motor Protection Curves - Eaton EMR-3MP0 Installation, Operation And Maintenance Manual

4 Protective Elements
4.4 Ultimate Trip Current
4.4.1

Motor Protection Curves

Ultimate trip
based on % of
full-load
amperes
(100% shown)
I²T curves
(I is an effective
current including
I1 and kI2.)
Fig. 39: Motor Protection Curve (Example 1).
160
multiples of FLA
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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
EMR-3MP0