Relay Selection Over Current
Motor
415 v
Rating 3 phase
Full Load current(Approx)
Relay scale
 Back-up fuse
Recommended
HP
KW
AMPS
.
HRC
Rewirable(SWG)
0.05
0.
0.
0.15 - 0.25
1
.
0.10
0.
0.
0.25 - 0.40
2
.
0.125
0.
0.
0.25 - 0.40
2
.
0.15
0.
0.
0.40 - 0.65
4
35
0.20
0.
0.
0.40 - 0.65
4
35
0.25
0.
0.
0.60 - 1.00
4
35
0.33
0.
0.
0.60 - 1.00
6
32
0.50
0.
1.28
1.00 - 1.60
6
32
0.75
0.
1.60
1.50 - 2.50
6
32
1.00
0.
2.0
1.50 - 2.50
6
25
1.25
0.
2.1
1.50 - 2.50
0
25
1.50
1.
2.50
2.50 - 4.00
10
25
1.75
1.
3.00
2.50 - 4.00
15
25
2.00
1.
3.5
2.50 - 4.00
15
25
2.50
1.
4.8
4.00 - 6.50
15
25
3.00
2.25
5.0
4.00 - 6.50
15
25
4.00
3.00
6.2
4.00 - 6.50
20
23
5.00
3.75
7.5
6.00 - 10
20
23
6.00
4.50
9.0
6.00 - 10
25
21
7.5
5.50
11.0
9.00 - 14
25
21

STANDARD MOTOR HP RATING
.25
5
30
200
110
450
900
3000
.50
10
40
250
175
500
1000
3500
.75
15
50
300
150
600
1250
4000
1.00
20
60
350
700
2250
1500
4500
1.50
25
75
400
800
2500
1750
5000

ELECTRICAL MOTOR SPEEDS
No of Poles
Synchronous speed
Induction speed
No. of Poles
Synchronous speed
Induction speed
2
3000
2900
12
500
485
4
1500
1440
14
428
410
6
1000
970
16
375
360
8
750
725
18
333
320
10
600
580
20
300
290

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