Page 13 - Fuse link Catalogue

MOTOR CIRCUIT PROTECTION

Special motor conditions:
Suitable adjustments to the recommended ratings may be necessary if any of the following conditions occur singly or in combination:
a) Starting currents in excess of the assumed ones.
b) Long run up times due to high inertia loads.
c) Larger number of starts per operating cycle (the recommendations below allow for two starts in rapid succession and up to eight starts per hour).
d) High enclosure temperature.

Table 3 Direct-on-line starting Table 4 Assisted starting**
(Star/delta, auto-transformer, etc.)
Motor FLC Recommended Alternative Motor FLC Recommended Alternative
fuse link motor circuit fuse link motor circuit
Type ‘gG rating Type ‘gG rating
Type ‘gM’ Type ‘gM’
Amp Amp
FROM TO AMP FROM TO AMP
0 0.7 2 0 1.4 2
0.8 1.4 4 1.5 2.1 4
1.5 2.0 6 2.2 3.1 6
2.1 3.0 10 3.2 5.5 10
3.1 6.1 16 5.6 10 16
6.2 9.0 20 10.1 14 20
9.1 11.0 25 20M25+ 14.1 18 25 20M25
11.1 14.4 32 20M32+ 18.1 22 32
14.5 15.4 35 32M35 22.1 28 35 32M35
15.5 18.0 40 32M40 28.1 32 40 32M40
18.1 22.0 50 32M50 32.1 40 50
22.1 28.0 63 32M63 40.1 51 63
28.1 45 80 63M80 51.1 80 80
45.1 58 100 63M100 80.1 100 100
58.1 80 125 100M125 100.1 125 125
80.1 99 160 100M160 125.1 160 160
99.1 128 200 100M200 160.1 200 200
128.1 180 250 200M250 200.1 250 250
180.1 216 315 200M315* 250.1 315 315
216.1 270 355 315M355 315.1 355 355
270.1 328 400 315M400 355.1 400 400
328.1 385 450 400M450 400.1 450 450
385.1 430 500 450.1 500 500
430.1 500 560 500.1 560 560
500.1 560 630 560.1 630 630
** These recommendations apply for ambient temperatures up to
560.1 620 670 630M670
35°C. At higher ambient temperatures, some fuse links need to be
de-rated as indicated on page 9. The decreased rating then
becomes the maximum motor FLC at that temperature, eg at 50°C
a 630 Amp fuse link is used for motor FLC up to 540 Amps.

IPD INDUSTRIAL PRODUCTS Phone: 1300 556 601 www.ipdgroup.com.au
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