Rated fuse currents of 3 phase motors
|
Motor Rating |
415V |
kW |
HP |
Cosj
|
h
%
|
Rated
Motor
Current
A |
Fuse starting D.O.L
A |
Y/D
A |
0.06
0.09
0.12
0.18
0.25
0.37
0.55
0.75
1.1
1.5
2.2
3
4
5.5
7.5
11
15
18.5
22
30
37
45
55
75
90
110
132
160
200
250
315
400
450
500
560
630
|
0.08
0.12
0.16
0.25
0.33
0.5
0.75
1
1.5
2
3
4
5.5
7.5
10
15
20
25
30
40
50
60
75
100
125
150
175
220
270
350
422
536
603
670
750
845
|
0.7
0.7
0.7
0.7
0.7
0.72
0.75
0.79
0.81
0.81
0.81
0.82
0.82
0.82
0.82
0.84
0.84
0.84
0.84
0.85
0.86
0.86
0.86
0.86
0.86
0.86
0.87
0.87
0.87
0.87
0.87
0.88
0.88
0.88
0.88
0.88
|
58
60
60
62
62
66
69
74
74
74
78
80
83
86
87
87
88
88
92
92
92
93
93
94
94
94
95
95
95
95
96
96
96
97
97
97
|
0.21
0.30
0.40
0.58
0.8
1.1
1.5
1.8
2.6
3.5
4.8
6.4
8.2
10.9
14.6
20.9
28.2
35
40
53
65
78
96
129
155
189
222
269
337
421
525
-
-
-
-
-
|
2
2
2
2
4
4
6
6
10
16
16
20
20
25
35
50
80
80
80
100
125
125
160
250
250
315
355
355
450
500
630
-
-
-
-
-
|
2
2
2
2
2
2
4
4
6
10
10
16
16
20
25
32
40
50
50
80
80
80
100
160
160
200
250
315
355
450
560
-
-
-
-
-
|
(Approximate figures for squirrel-cage motors).
Minimum fuse size for short-circuit protection of 3-phase motors.
The maximum size is determined by the requirements of the switchgear or overload relay
The rated motor currents are for standard 1500 r.p.m. 3-phase enclosed ventilated and totally enclosed fan-cooled motors.
D.O.L. starting : maximum starting current 6 x rated motor current. Maximum starting time : 5 s.
Y/D starting : maximum starting current 2 x rated motor current. Maximum starting time : 15 s.
set overload relay in the phase lead to 0.58 x rated motor current.
Rated fuse currents for Y/D starting are also valid for 3-phase motors with slip-ring rotors.
For higher rated currents, starting currents / longer starting times, larger fuses will be required.
Table is valid for 'slow' / 'gL' fuses (DIN VDE 0636)
For NH fuses with aM characteristic, fuses = rated current selected.
|
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