4.1.11 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:
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. 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.
UL compliance
The fuses below are suitable for use on a circuit capable of
delivering 100,000 Arms (symmetrical), 240 V, or 480 V, or
600 V depending on the drive voltage rating. With the
proper fusing, the drive Short Circuit Current Rating (SCCR)
is 100,000 Arms.
Power size
Frame
Rating
Bussmann
Spare
Bussmann
Est. Fuse Power Loss [W]
Size
Voltage (UL)
Amperes
P/N
P/N
400V
460V
P315T5
F8/F9
700
700
170M4017
176F9179
25
19
P355T5
F8/F9
700
700
170M4017
176F9179
30
22
P400T5
F8/F9
700
700
170M4017
176F9179
38
29
P450T5
F8/F9
700
700
170M4017
176F9179
3500
2800
P500T5
F10/F11
700
900
170M6013
176F9180
3940
4925
P560T5
F10/F11
700
900
170M6013
176F9180
2625
2100
P630T5
F10/F11
700
900
170M6013
176F9180
3940
4925
P710T5
F10/F11
700
1500
170M6018
176F9181
45
34
P800T5
F12/F13
700
1500
170M6018
176F9181
60
45
P1M0T5
F12/F13
700
1500
170M6018
176F9181
83
63
Table 4.1 Line Fuses, 380–500V
Power size
Frame
Rating
Bussmann
Spare
Bussmann
Est. Fuse Power Loss [W]
Size
Voltage (UL)
Amperes
P/N
P/N
600V
690V
P450T7
F8/F9
700
630
170M4016
176F9179
13
10
P500T7
F8/F9
700
630
170M4016
176F9179
17
13
P560T7
F8/F9
700
630
170M4016
176F9179
22
16
P630T7
F8/F9
700
630
170M4016
176F9179
24
18
P710T7
F10/F11
700
900
170M6013
176F9180
26
20
P800T7
F10/F11
700
900
170M6013
176F9180
35
27
P900T7
F10/F11
700
900
170M6013
176F9180
44
33
P1M0T7
F12/F13
700
1500
170M6018
176F9181
26
20
P1M2T7
F12/F13
700
1500
170M6018
176F9181
37
28
P1M4T7
F12/F13
700
1500
170M6018
176F9181
47
36
Table 4.2 Line Fuses, 525–690V
How to Install
VLT AQUA 12-Pulse High Power Instruction Manual
4-12
MG.20.Y1.22 - VLT
®
is a registered Danfoss trademark
4
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