1.3.4 Fuses
Branch circuit protection
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 100,000 A
rms
(symmetrical),
480 V maximum.
Non UL compliance
If UL/cUL is not to be complied with, Danfoss recommends
using the fuses mentioned in
Table 1.6
, which ensures
compliance with EN50178/IEC61800-5-1:
In case of malfunction, not following the fuse recommen-
dation 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
1X200-240 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
3x200-240 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
3x380-480 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 1.6 Fuses
Quick Guide
VLT
®
Micro Drive Quick Guide
MG02B702 - VLT
®
is a registered Danfoss trademark
5
1
1
