+DC
BR-
BR+
U
V
W
M
A
I N
S
L1 L2 L3
91 92 93
RELA
Y 1 RELA
Y 2
99
- L
C -
130BA264.10
Figure 1.7 Tighten support bracket on line power wires
1.3.7 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-circuit and overcurrent protected according to national and local regulations.
Short circuit protection
Danfoss recommends using the fuses listed in
Table 1.9
to protect service personnel or equipment in case of an internal
failure in the unit or short circuit on the DC link. The adjustable frequency drive provides full short circuit protection in case
of a short circuit on the compressor.
Overcurrent protection
Provide overload protection to avoid overheating of the cables in the installation. Overcurrent protection must always be
carried out according to local and national regulations. Circuit breakers and fuses must be designed for protection in a
circuit capable of supplying a maximum of 100,000 A
rms
(symmetrical), 480 V maximum.
UL/Non-UL compliance
Use the fuses listed in
Table 1.9
to ensure compliance with UL or IEC 61800-5-1.
NOTICE!
In the event of malfunction, failure to follow the protection recommendation may result in damage to the adjustable
frequency drive.
Fuse
UL
Non-UL
Bussmann
Bussmann
Bussmann
Bussmann
Max fuse
CDS 803
Type RK5
Type RK1
Type J
Type T
Type G
3x200–240 V IP20
4 TR/VZH028
FRS-R-50
KTN-R50
JKS-50
JJN-50
50
5 TR/VZH035
FRS-R-50
KTN-R50
JKS-50
JJN-50
50
6.5 TR/VZH044
FRS-R-80
KTN-R80
JKS-80
JJN-80
65
3x380–480 V IP20
4 TR/VZH028
FRS-R-25
KTS-R25
JKS-25
JJS-25
25
5 TR/VZH035
FRS-R-25
KTS-R25
JKS-25
JJS-25
25
6.5 TR/VZH044
FRS-R-50
KTS-R50
JKS-50
JJS-50
50
Table 1.9 Fuses
Quick Guide
Quick Guide
8
Danfoss A/S © Rev. 08/2014 All rights reserved.
MG18M122
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