Installing Upstream Fuses; Upstream Fuse Considerations; Recommended Fuse Ratings For Iec Installation - Danfoss D9h Operating Manual

VLT® AutomationDrive FC 302
Operating Guide

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
N90K Mersen NH1GG50V250
N110 Mersen NH2GG50V315
N132 Mersen NH2GG50V355
N160 Mersen NH3GG50V425
N200 Mersen NH3AGG50V630
N250 Mersen NH3AGG50V630
N315 Mersen NH4GG50V800
N355 Mersen NH4GG50V1000
N400 Mersen NH4GG50V1000
N450 Mersen NH4GG50V1000
N500 Mersen NH4GG50V1250
Table 70: Recommended Fuse Ratings for IEC Installation, 525–690 V
Model Fuse P/N
N90K Mersen NH2GG69V250
N110 Mersen NH2GG69V250
N132 Mersen NH2GG69V250
N160 Mersen NH2GG69V315
N200 Mersen NH3GG69V355
108 | Danfoss A/S © 2021.10
Fuse size Rated cur-
rent [A]
1 250
2 315
2 355
3 425
3 630
3 630
4 800
4 1000
4 1000
4 1000
4 1250
Fuse size Rated cur-
rent [A]
2 250
2 250
2 250
2 315
3 355
Minimum pro- Maximum fuse
spective SC cur- rating F1 [A]
rent of the grid
[kA]
6.8 250
7 315
8.5 355
10 425
13 630
13 630
18 800
25 1000
25 1000
25 1000
33 1250
Minimum pro- Maximum fuse
spective SC cur- rating F1 [A]
rent of the grid
[kA]
6.5 250
6.5 250
6.5 250
7.5 315
8.5 355
Electrical Installation
Minimum Type F1
voltage rating
[V]
500 gG/gL
500 gG/gL
500 gG/gL
500 gG/gL
500 gG/gL
500 gG/gL
500 gG/gL
500 gG/gL
500 gG/gL
500 gG/gL
500 gG/gL
Minimum volt- Type F1
age rating [V]
690 gG/gL
690 gG/gL
690 gG/gL
690 gG/gL
690 gG/gL
AQ262139143212en-000301 / 130R0879