Grundfos NBE Series - Electrical Connection and Protection; Electrical Supply Systems and Safety Protection

Model J
P2
Maximum line reactor size
[mH]
[kW] [hp] 1750-2200 rpm
3500-4000 rpm
4000-5900 rpm
2.2 3 - 1.5
4 5 0.7 0.7
5.5 7.5 0.9 0.3
7.5 10 0.6 0.6
11 15 0.3 0.3
Model K
P2
Maximum line reactor size
[mH]
[kW] [hp] 1750-2200 rpm 3500-4000 rpm
11 15 0.3 -
15 20 0.2 0.2
18.5 25 0.2 0.2
22 30 0.2 0.2
26 35 0.2 0.2
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]
Recommended
[A]
Maximum
[A]
Fuse type
11 35 60 RK1, Class J or T UL listed fuse
15 50 80 RK1, Class J or T UL listed fuse
18.5 60 80 RK1, Class J or T UL listed fuse
22 70 80 RK1, Class J or T UL listed fuse
3 x 400-480 V, MGE Model K
Motor size
[kW]
Recommended
[A]
Maximum
[A]
Fuse type
26 80 80 RK1, Class J or T UL listed fuse
10
Appendix A