Enclosure Power [hp] Recommended fuse
size
Recommended max-
imum fuse
Recommended circuit breaker
Eaton/Moeller
Maximum trip lev-
el [A]
60
gG-100
60
aR-160
aR-250
C2
100
aR-200
aR-250
NZMB2-A250
250
C3
50
gG-63
gG-150
NZMB2-A200
150
60
gG-100
gG-150
NZMB2-A200
C4
75
aR-160
aR-250
NZMB2-A250
250
100
aR-200
Table 16: 525–690 V, Enclosure Size D
Enclosure
Power [hp]
Recommended fuse size
Recommended maximum fuse
D1h/D3h
125
aR-315
aR-315
150
aR-315
aR-315
200
aR-315
aR-315
4.11.3 UL Compliance
Fuse classification for UL Compliance
N O T I C E
UL COMPLIANCE
To comply with NEC 2017, it is mandatory to use fuses or circuit breakers. Danfoss recommends using a selection of the fuses
listed in the following tables. These fuses are suitable for use on a circuit capable of delivering 100000 A
rms
(symmetrical), 240 V,
500 V, or 600 V depending on the drive voltage rating. With the proper fusing, the drive short-circuit current rating (SCCR) is
100000 A
rms
.
For semiconductor fuse types, the drive controller and the overcurrent protection device must be integrated within the same over-
all assembly.
Table 17: UL Fuse Classification Chart
UL class Fuse overload characteristics
Interrupting rating
[A]
AC voltage rating
[V]
Available ampere rat-
ing
RK1
Ultra fast-acting, current limiting/time de-
lay
200.000
250
600
1–600
T
Fast-acting
200.000
300
600
1–1.200
J
Fast-acting
200.000
600
1–600
CC
Fast-acting
200.000
600
5–30
AN354546796134en-000201 / 130R0954
26 | Danfoss A/S © 2021.05
Electrical Installation
VLT®AutomationDrive EZ FC 321
Installation Guide
