Fuses - Danfoss FC 300 Instruction Manual

FC 300 Instruction Manual

Fuses

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Branch circuit protection:
In order to protect the installation against electrical and fire hazard, all branch circuits
in an installation, switch gear, machines, etc., must be short-circuit and overcurrent-
protected according to national/international regulations.
Short circuit protection:
The adjustable frequency drive must be protected against short-circuit to avoid electrical or fire
hazard. Danfoss recommends using the fuses mentioned below to protect service personnel or
other equipment in case of an internal failure in the drive. The adjustable frequency drive provides
full short-circuit protection in case of a short-circuit on the motor output.
Overcurrent protection:
Provide overload protection to avoid fire hazard due to overheating of the cables in the installation.
The adjustable frequency drive is equipped with internal overcurrent protection that can be used
for upstream overload protection (UL applications excluded). See par. 4-18. Moreover, fuses
or circuit breakers can be used to provide overcurrent protection in the installation. Overcurrent
protection must always be provided according to national regulations.
Fuses must be designed for protection in a circuit capable of supplying a maximum of
100,000 A (symmetrical), 500 V maximum.
rms
Non-UL compliance
If UL/cUL is not to be complied with, we
recommend using the following fuses, which will
ensure compliance with EN50178:
In case of malfunction, not following the
recommendation may result in unnecessary damage
to the adjustable frequency drive.
How to Install
1) Max. fuses - see national/international
regulations for selecting an applicable fuse size.
MG.33.A6.22 - VLT is a registered Danfoss trademark
FC 30X Max. fuse size
K25-K75 10A 1)
1K1-2K2 20A 1)
3K0-3K7 32A 1)
K37-1K5 10A 1)
2K2-4K0 20A 1)
5K5-7K5 32A 1)
1)
11K 63A
1)
15K 63A
18K 63A 1)
22K 80A 1)
Voltage Type
200-240 V type gG
200-240 V type gG
200-240 V type gG
380-500 V type gG
380-500 V type gG
380-500 V type gG
380-500 V type gG
380-500 V type gG
380-500 V type gG
380-500 V type gG
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