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Table for the current load of copper busbars acc. to DIN 43671

				continous currents in A
width x thickness mm			material	AC up to 60 Hz								DC/AC up to 16 2/3 Hz
				coated				uncoated				coated				uncoated
				number of busbars				number of busbars				number of busbars				number of busbars
				1	2	3	4	1	2	3	4	1	2	3	4	1	2	3	4
				I	II	III	II⁵⁰II	I	II	III	II⁵⁰II	I	II	III	IIII	I	II	III	IIII
12	x	2		123	202	228		108	182	216		123	202	233		108	182	220
15	x	2		148	240	261		128	212	247		148	240	267		128	212	252
15	x	3		187	316	381		162	282	361		187	316	387		162	282	365
20	x	2		189	302	313		162	264	298		189	302	321		162	266	303
20	x	3		237	394	454		204	348	431		237	394	463		204	348	437
20	x	5		319	560	728		274	500	690		320	562	729		274	502	687
20	x	10		497	924	1320		427	825	1180		499	932	1300		428	832	1210
25	x	3		287	470	525		245	412	498		287	470	536		245	414	506
25	x	5		384	662	869		327	586	795		384	664	841		327	590	794
30	x	3		337	544	593		285	476	564		337	546	608		286	478	575
30	x	5		447	760	944		379	672	896		448	766	950		380	676	897
30	x	10	E-Cu F30/	676	1200	1670		573	1060	1480		683	1230	1630		579	1080	1520
40	x	3	Cu-ETP	435	692	725		366	600	690		436	696	748		367	604	708
40	x	5	4/4 hard	573	952	1140		482	836	1090		576	966	1160		484	848	1100
40	x	10		850	1470	2000	2580	715	1290	1770	2280	865	1530	2000		728	1350	1880
50	x	5		697	1140	1330	2010	583	994	1260	1920	703	1170	1370		588	1020	1300
50	x	10		1020	1720	2320	2950	852	1510	2040	2600	1050	1830	2360		875	1610	2220
60	x	5		826	1330	1510	2310	688	1150	1440	2210	836	1370	1580	2060	696	1190	1500	1970
60	x	10		1180	1960	2610	3290	985	1720	2300	2900	1230	2130	2720	3580	1020	1870	2570	3390
80	x	5		1070	1680	1830	2830	885	1450	1750	2720	1090	1770	1990	2570	902	1530	1890	2460
80	x	10		1500	2410	3170	3930	1240	2110	2790	3450	1590	2730	3420	4490	1310	2380	3240	4280
100	x	5		1300	2010	2150	3300	1080	1730	2050	3190	1340	2160	2380	3080	1110	1810	2270	2960
100	x	10		1810	2850	3720	4530	1490	2480	3260	3980	1940	3310	4100	5310	1600	2890	3900	5150
120	x	10		2110	3280	4270	5130	1740	2860	3740	4500	2300	3900	4780	6260	1890	3390	4560	6010
160	x	10		2700	4130	5360	6320	2220	3590	4680	5530	3010	5060	6130	8010	2470	4400	5860	7110
200	x	10		3290	4970	6430	7490	2690	4310	5610	6540	3720	6220	7460	9730	3040	5390	7150	9390

Remark: Continuous currents for busbars Cu-ETP/E-Cu according to the DIN regulations for rectangular bars in interieur systems at +35° C air temperature and + 65° C bar temperature and vertical bar position, bar packages with spaces like the bar thickness respectively minimum 50 mm by laying of 4 busbars or when working with AC-current with a main distance of > 0,8 x main conductor distance (measured middle to middle of the bars). Values for a changed ambient temperature and reducing factors for changed applications are contained in the DIN 43671.

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Table for the current load of copper busbars acc. to DIN 43671