
Protective Elements
Motor Protection Curves
Motor Protection Curve (Example 1)
Page 394
EN MRM4 01/11
Ultimate trip
based on % of
full-load
amperes
(100% shown)
I
2
T Curves
(I is an effective
current including
I
1
and kI
2
)
Maximum allowable
stall 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
multiples of Ib
t [s
]
Summary of Contents for MRM4
Page 1: ...MRM4 HighPROTEC Motor Protection Device Manual DOK HB MRM4E...
Page 3: ...Order Code EN MRM4 01 11 Page 3...
Page 18: ...Important Definitions Page 18 EN MRM4 01 11 41 SG Prot ON 42 SG ON Cmd SG Prot ON SG ON Cmd...
Page 115: ...Navigation Operation Navigation Operation EN MRM4 01 11 Page 115 1 2 3 5 7 6 8 10 9...
Page 162: ...Recorder Name Description I 2 TripCmd Signal Trip Command Page 162 EN MRM4 01 11...