Grundfos CRE Serie Notice D'installation Et De Fonctionnement page 111

Line reactors are often required for six-pulse variable speed drives. Please observe that the MGE,
MLE utilize a small DC capacitor concept for lower harmonics and exceeding the maximum
inductance may cause resonance between reactor and the MGE, MLE that will reduce the lifetime of
the product.
Short-circuit current
Model J: If a short circuit occurs, the motor can be used on a mains supply delivering not more than 5000 RMS
symmetrical amperes, 600 V maximum.
Model K: Suitable for use on a circuit capable of delivering not more than 5000 rms symmetrical amperes, 480
V maximum when protected by RK1, J or T Class fuses, rated 600 V.
Fuses
Model J: Fuses used for motor protection must be rated for minimum 500 V. Motors up to and including 7.5 kW
(10 hp) require class K5 UL-listed fuses. Any UL-listed fuse can be used for motors of 11 kW (15 hp).
Model K: Fuses used for motor protection must be rated for minimum 600 V.
For fuse sizes, see the section on recommended size of fuses.
3 x 380-480 V, MGE Model K
Motor size
[kW]
11
15
18.5
22
3 x 400-480 V, MGE Model K
Motor size
[kW]
26
3 x 200-240 V, MGE Model K
Motor size
[kW]
7.5
11
Recommended
[A]
35
50
60
70
Recommended
[A]
80
Recommended
[A]
70
80
Maximum
Fuse type
[A]
RK1, Class J or T UL listed
60
RK1, Class J or T UL listed
80
RK1, Class J or T UL listed
80
RK1, Class J or T UL listed
80
Maximum
[A]
RK1, Class J or T UL
80
Maximum
[A]
RK1, Class J or T UL
80
RK1, Class J or T UL
80
fuse
fuse
fuse
fuse
Fuse type
listed fuse
Fuse type
listed fuse
listed fuse
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