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5.9 Installing Upstream Fuses
5.9.1 Upstream Fuse Considerations
Factory fuse options like a fusible disconnector or MCCB protect the busbars and circuits within the drive. To protect the cables, an
installer should use separate F1 fuses for upstream protection.
Danfoss recommends the fuse type gG (IEC 60269-1) for the mains fuses. Use only fuses with a sufficient voltage rating accord-
ing to the mains voltage. Do not use larger fuses than what is recommended. These fuses are selected for short-circuit protec-
tion only.
Operation time of the fuse must be less than 0.4 s. The operation time must also agree with the fuse type and the impedance of
the supply circuit.
The recommended mains cable and fuse sizes are valid up to a cable length of 100 m (328 ft), with mains having a short-circuit
current of 20 kA. Recommended cable sizes are shown in the
Electrical Data
section.
Danfoss recommends the use of FC1 fuses to meet short-circuit protection for any enclosed drives supplied with only the non-
fusible disconnect, a non-fusible disconnect and contactor, or a contactor only option.
5.9.2 Recommended Fuse Ratings for IEC Installation
Table 69: Recommended Fuse Ratings for IEC Installation, 380–500 V
Model Fuse P/N
Fuse size Rated cur-
rent [A]
Minimum pro-
spective SC cur-
rent of the grid
[kA]
Maximum fuse
rating F1 [A]
Minimum
voltage rating
[V]
Type F1
N90K
Mersen NH1GG50V250
1
250
6.8
250
500
gG/gL
N110
Mersen NH2GG50V315
2
315
7
315
500
gG/gL
N132
Mersen NH2GG50V355
2
355
8.5
355
500
gG/gL
N160
Mersen NH3GG50V425
3
425
10
425
500
gG/gL
N200
Mersen NH3AGG50V630 3
630
13
630
500
gG/gL
N250
Mersen NH3AGG50V630 3
630
13
630
500
gG/gL
N315
Mersen NH4GG50V800
4
800
18
800
500
gG/gL
N355
Mersen NH4GG50V1000 4
1000
25
1000
500
gG/gL
N400
Mersen NH4GG50V1000 4
1000
25
1000
500
gG/gL
N450
Mersen NH4GG50V1000 4
1000
25
1000
500
gG/gL
N500
Mersen NH4GG50V1250 4
1250
33
1250
500
gG/gL
Table 70: Recommended Fuse Ratings for IEC Installation, 525–690 V
Model Fuse P/N
Fuse size Rated cur-
rent [A]
Minimum pro-
spective SC cur-
rent of the grid
[kA]
Maximum fuse
rating F1 [A]
Minimum volt-
age rating [V]
Type F1
N90K
Mersen NH2GG69V250 2
250
6.5
250
690
gG/gL
N110
Mersen NH2GG69V250 2
250
6.5
250
690
gG/gL
N132
Mersen NH2GG69V250 2
250
6.5
250
690
gG/gL
N160
Mersen NH2GG69V315 2
315
7.5
315
690
gG/gL
N200
Mersen NH3GG69V355 3
355
8.5
355
690
gG/gL
AQ262139143212en-000301 / 130R0879
108 | Danfoss A/S © 2021.10
Electrical Installation
VLT® AutomationDrive FC 302
Operating Guide
Содержание D9h
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