1.3.5 Fuses
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-circuited and
overcurrent protected according to national/international
regulations.
Short circuit protection:
Danfoss recommends using the fuses mentioned in the
following tables to protect service personnel or other
equipment in case of an internal failure in the unit or
short-circuit on DC-link. The frequency converter provides
full short circuit protection in case of a short-circuit on the
motor or brake output.
Overcurrent protection:
Provide overload protection to avoid overheating of the
cables in the installation. Overcurrent protection must
always be carried out according to national regulations.
Fuses must be designed for protection in a circuit capable
of supplying a maximum of 100,000A
rms
(symmetrical),
480V maximum.
Non UL compliance:
If UL/cUL is not to be complied with, Danfoss recommends
using the fuses mentioned in the below table, which will
ensure compliance with EN50178/IEC61800-5-1:
In case of malfunction, not following the fuse recommen-
dation may result in damage to the frequency converter.
FC 51
Max. Fuses UL
Max. fuses non UL
Bussmann
Bussmann
Bussmann
Littel fuse
Ferraz-
Shawmut
Ferraz-
Shawmut
1 X 200-240V
kW
Type RK1
Type J
Type T
Type RK1
Type CC
Type RK1
Type gG
0K18 - 0K37
KTN-R15
JKS-15
JJN-15
KLN-R15
ATM-R15
A2K-15R
16A
0K75
KTN-R25
JKS-25
JJN-25
KLN-R25
ATM-R25
A2K-25R
25A
1K5
KTN-R35
JKS-35
JJN-35
KLN-R35
-
A2K-35R
35A
2K2
KTN-R50
JKS-50
JJN-50
KLN-R50
-
A2K-50R
50A
3 x 200-240V
0K25
KTN-R10
JKS-10
JJN-10
KLN-R10
ATM-R10
A2K-10R
10A
0K37
KTN-R15
JKS-15
JJN-15
KLN-R15
ATM-R15
A2K-15R
16A
0K75
KTN-R20
JKS-20
JJN-20
KLN-R20
ATM-R20
A2K-20R
20A
1K5
KTN-R25
JKS-25
JJN-25
KLN-R25
ATM-R25
A2K-25R
25A
2K2
KTN-R40
JKS-40
JJN-40
KLN-R40
ATM-R40
A2K-40R
40A
3K7
KTN-R40
JKS-40
JJN-40
KLN-R40
-
A2K-40R
40A
3 x 380-480V
0K37 - 0K75
KTS-R10
JKS-10
JJS-10
KLS-R10
ATM-R10
A6K-10R
10A
1K5
KTS-R15
JKS-15
JJS-15
KLS-R15
ATM-R15
A2K-15R
16A
2K2
KTS-R20
JKS-20
JJS-20
KLS-R20
ATM-R20
A6K-20R
20A
3K0
KTS-R40
JKS-40
JJS-40
KLS-R40
ATM-R40
A6K405R
40A
4K0
KTS-R40
JKS-40
JJS-40
KLS-R40
ATM-R40
A6K-40R
40A
5K5
KTS-R40
JKS-40
JJS-40
KLS-R40
-
A6K-40R
40A
7K5
KTS-R40
JKS-40
JJS-40
KLS-R40
-
A6K-40R
40A
11K0
KTS-R60
JKS-60
JJS-60
KLS-R60
-
A6K-60R
63A
15K0
KTS-R60
JKS-60
JJS-60
KLS-R60
-
A6K-60R
63A
18K5
KTS-R60
JKS-60
JJS-60
KLS-R60
-
A6K-60R
80A
22K0
KTS-R60
JKS-60
JJS-60
KLS-R60
-
A6K-60R
80A
Table 1.3 Fuses
Quick Guide
VLT Micro Drive Quick Guide
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MG.02.B6.02 - VLT
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is a registered Danfoss trademark
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