6.6 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 recommendation may result in damage to the frequency converter and the
installation.
FC 51
Max. Fuses UL
Max. fuses non UL
Bussmann
Bussmann
Bussmann
Littel fuse
Ferraz-
Shawmut
Ferraz-
Shawmut
1 X 200-240 V
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 200-240 V
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 380-480 V
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 6.3 Fuses
How to Install
VLT Micro Drive Design Guide
MG02K102 - VLT
®
is a registered Danfoss trademark
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