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D-67
Permissible current and selection of horizontal busbars
The goal is to optimise busbar size according to the installation and operating criteria.
Horizontal busbars
Fupact INF/ISFT/ISFL
Flat busbars, 5 mm thick
Type of bars
Permissible current (A)
Ambient temperature around the switchboard
25 °C
30 °C
35 °C
40 °C
45 °C
50 °C
Size per phase
IP
y
31 IP > 31 IP
y
31 IP > 31 IP
y
31 IP > 31 IP
y
31 IP > 31 IP
y
31 IP > 31 IP
y
31 IP > 31
1 bar, 60 x 5 mm
800
750
760
700 710 650 660 600 610 550 560
b
1 bar, 80 x 5 mm
1000 910
970
860 910 810 860 750 810 700 750
b
2 bars, 60 x 5 mm
1400 1250 1320 1160 1250 1070 1160 980 1070 880 980
b
2 bars, 80 x 5 mm
1700 1500 1600 1400 1500 1280 1400 1160 1280 1030 1160
b
Flat busbars, 10 mm thick
Type of bars
Permissible current (A)
Ambient temperature around the switchboard
25 °C
30 °C
35 °C
40 °C
45 °C
50°C
Size per phase
IP
y
31 IP > 31 IP
y
31 IP > 31 IP
y
31 IP > 31 IP
y
31 IP > 31 IP
y
31 IP > 31 IP
y
31 IP > 31
1 bar, 50 x 10 mm
1150 1000 1080 930 1000 850 930 760 850 670 760
b
1 bar, 60 x 10 mm
1400 1250 1320 1160 1250 1070 1160 980 1070 880 980
b
1 bar, 80 x 10 mm
1700 1500 1600 1400 1500 1280 1400 1160 1280 1030 1160
b
2 bars, 50 x 10 mm
1940 1690 1840 1560 1700 1420 1560 1270 1420 1100 1270
b
2 bars, 60 x 10 mm
2170 1900 2040 1750 1900 1590 1750 1420 1590 1240 1420
b
2 bars, 80 x 10 mm
2670 2340 2500 2160 2340 1970 2160 1770 1970 1550 1770
b
2 bars, 100 x 10 mm
3120 2750 2930 2520 2750 2310 2520 2070 2310 1820 2070
b
Rear horizontal busbars
ISFT/ISFL
Flat busbars, 10 mm thick
Device
Permissible current (A)
Ambient temperature around the switchboard
25 °C
30 °C
35 °C
40 °C
45 °C
50°C
Size per phase IP
y
31 IP > 31 IP
y
31 IP > 31 IP
y
31 IP > 31 IP
y
31 IP > 31 IP
y
31 IP > 31 IP
y
31 IP > 31
ISFT 160
1bar, 50 x 10 mm 730
680
680
630 630 570 570 510 510 450 450
b
ISFL 160
1bar, 60 x 10 mm 1400 1250 1320 1160 1250 1070 1160 980 1070 880 980
b
1bar, 80 x 10 mm 1700 1500 1600 1400 1500 1280 1400 1160 1280 1030 1160
b
ISFL 250/400/630 1bar, 80 x 10 mm 1700 1500 1600 1400 1500 1280 1400 1160 1280 1030 1160
b
1bar, 100 x 10mm 2050 1800 1930 1680 1800 1540 1680 1400 1540 1240 1400
b
1bar, 120 x 10 mm 2390 2100 2250 1950 2100 1800 1950 1630 1800 1440 1630
b
connection impossible due to operating-temperature limits of the devices installed
in the switchboard.
b
Designing busbars
Fupact INF, ISFT, ISFL
Horizontal busbars
Additional informations
Designing electrical
characteristics