Fuses - Danfoss FC 300 Design Manual

8 Electrical Installation

8.3 Fuses

Branch circuit protection:
In order to protect the installation against electrical and fire hazards, all branch circuits in an installation, switch gear, machines, etc. must be short-
circuited 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 and 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 an
internal overcurrent protection that can be used for upstream overload protection (UL applications excluded). See par. 4-18
fuses or circuit breakers can be used to provide the overcurrent protection in the installation. Overcurrent protection must always be carried out according
to national regulations.
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.
8
K25-K75
1K1-2K2
3K0-3K7
5K5-7K5
11K
15K-18K5
22K
30K
37K
K37-1K5
2K2-4K0
5K5-7K5
11K-18K
22K
30K
37K
45K
55K-75K
* Type gG is not applicable to frame sizes C2 in IP21 enclosure and frame size C4. In this case, type aR is recommended.
11-22K (B2)
30K (C2)
37K (C2)
45K (C2)
55K-75K (C2)
P90 - P200
P250 - P400
1) Max. fuses - refer to national/international regulations to select an appropriate fuse size.
8-22
Max. fuse size 1)
10A
20A
32A
63A
80A
125A
160A
200A
250A
1)
Max. fuse size
10A
20A
32A
63A
80A
100A
125A
160A
250A
1)
Max. fuse size
63 A
80 A
100 A
125 A
160 A
380–500 V
380–500 V
MG.33.BC.22 - VLT ® is a registered Danfoss trademark
Min. rated voltage
200–240 V
200–240 V
200–240 V
200–240 V
200–240 V
200–240 V
200–240 V
200–240 V
200–240 V
Min. rated voltage
380–500 V
380–500 V
380–500 V
380–500 V
380–500 V
380–500 V
380–500 V
380–500 V
380–500 V
Voltage
525–690 V
525–690 V
525–690 V
525–690 V
525–690 V
type gG
type gR
FC 300 Design Guide
Current Limit
. Moreover,
Type
type gG
type gG
type gG
type gG
type gG
type gG
type aR
type aR
type aR
Type
type gG
type gG
type gG
type gG
type gG
type gG
type gG
type gG*
type gG*
Type
type gG
type gG
type gG
type gG
type gG