GW Potts Electrical Ltd: Useful Formulae
Introduction
Approved Motor Stockist
Pump Stockist
Electrical Motor Components Stockist
Approved Repair/Rewind Service
Motor Rewind/Overhaul Price List
Useful Data

 

MOTOR RATINGS
FULL LOAD CURRENT (FLC) OF 3PHASe INDUCTION
MOTORS AT VOLTAGES SHOW

KW
H.P
@240V
@380V
@415V
@440V
@550V
0.37 0.5 1.75 1.1 1.0 0.95 0.75
0.55 0.75 2.6 1.65 1.5 1.4 1.1
0.75 1.0 3.3 2.1 1.9 1.8 1.5
1.1 1.5 4.35 2.75 2.5 2.35 1.85
1.5 2.0 5.9 3.7 3.4 3.2 2.6
2.2 3.0 8.3 5.3 4.8 4.6 3.6
3.0 4.0 11.0 7.0 6.4 6.1 4.9
4.0 5.5 14.0 8.9 8.1 7.6 6.1
5.5 7.5 20.0 12.6 11.6 10.9 8.7
7.5 10.0 25.0 15.8 14.4 13.6 10.9
11.0 15.0 26.5 23.0 21.1 19.9 15.7
15.0 20.0 48.5 31.0 28.0 26.0 21.0
18.5 25.0 60.0 38.0 35.0 33.0 26.0
22.0 30.0 72.0 45.0 41.0 39.0 31.0
30.0 40.0 96.0 61.0 55.0 52.0 42.0
37.0 50.0 120.0 76.0 69.0 65.0 52.0
45.0 60.0 144.0 91.0 83.0 78.0 63.0
55.0 75.0 171.0 108.0 99.0 93.0 74.0
75.0 100.0 235.0 149.0 136.0 129.0 103.0
90.0 120.0 278.0 176.0 162.0 152.0 122.0
110.0 150.0 354.0 218.0 200.0 188.0 151.0
132.0 175.0 403.0 252.0 231.0 218.0 177.0
150.0 200.0 454.0 288.0 263.0 248.0 198.0
160.0 215.0
-
 322.0 281.0 264.0 211.0
185.0 250.0
-
 354.0 323.0 306.0 245.0
200.0 270.0
-
 382.0 350.0 330.0 265.0
220.0 300.0
-
 420.0 385.0 363.0 291.0
250.0 335.0
-
 546.0 505.0 473.0 382.0
FULL LOAD CURRENT (FLC) OF 1PHASE MOTOR AT 240V 50Hz
KW
H.P
@240V
KW
H.P
@240V
  
0.12 0.17 1.6 0.75 1.0 6.5  
0.18 0.25 2.1 1.1 1.5 9.0  
0.25 0.33 3.0 1.5 2.0 12.0  
0.37 .05 3.5 2.2 3.0 16.5  
0.55 0.75 4.9 3.7 5.0 25.0  

Note: Values of 1 and 3 phase full-load current indication are typcial, using average efficiencies and power factor of 4 pole machines.

FUSE SELECTION
NOTE: MOTOR PROTECTION FUSES ARE NOT ACCOMMODATED IN STANDARD STARTERS
D.O.L START
7XFLC FOR 10S
ASSISTED START
3.5XFLC FOR 20S
RECOMMENDED FUSE LINK RATING
MOTOR FLC AMP
MOTOR FLC AMP
FROM
TO
FROM
TO
AMP
0
0.7
0
1.4
2
0.8
1.1
1.5
2.1
4
1.2
1.6
2.2
3.1
6
1.7
2.6
3.2
5.4
10
2.7
5.2
5.5
10.0
16
5.3
7.5
10.1
14.3
20
7.6
9.9
14.4
18.3
25
10.0
11.6
18.4
22.6
32.0
11.7
15.7
22.7
29.3
35.0
15.8
19.3
29.3
35.0
40
19.4
22.9
35.1
42.8
50
23.0
28.6
42.9
55.0
63
28.7
41.0
55.1
74.2
80
41.5
54.3
74.3
97.3
100
54.4
71.5
97.4
125.0
125
71.6
94.4
125.1
160.0
160
94.5
127.0
160.1
180.0
200
127.1
164.0
180.1
255.0
250
164.1
166.0
225.1
250.0
315
186.1
257.0
250.1
325.0
355
257.1
307.0
325.1
350.0
400
307.1
371.0
350.1
425.0
450
371.1
415.0
425.1
450.0
500
415.1
472.0
450.1
525.0
560
472.1
535.0
425.1
550.0
630
 
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