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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 67: Recommended Fuse Ratings for IEC Installation, 380–480 V
Minimum pro-
spective SC cur-
rent of the grid
[kA]
Maximum fuse
rating F1 [A]
Table 68: Recommended Fuse Ratings for IEC Installation, 525–690 V
Minimum pro-
spective SC cur-
rent of the grid
[kA]
Maximum fuse
rating F1 [A]
Minimum volt-
age rating [V]
AQ262141314214en-000301 / 130R0880104 | Danfoss A/S © 2021.11
Electrical Installation
VLT® HVAC Drive FC 102
Operating Guide
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