Busbar Systems

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Busbar Systems
8US 60 mm Busbar Systems
UL applications
10/26 Siemens LV 10 · 2014
10
■ Overview
Short-circuit strength
The short-circuit strength of the busbar system is dependent on
the distance of the busbar supports and on the busbar cross-
section.
The short-circuit strength of the whole system is dependent on
the short-circuit strength of the busbars and of the adapters with
circuit breakers or switch disconnectors. If one of these values
is lower than the prospective short-circuit current at the installa-
tion site, a current-limiting protective device has to be mounted
upstream of the 8US busbar system. This may also be mounted
as a feeder circuit breaker on the busbar system itself. The table
below provides a selection aid for this purpose.
Selection aid for UL applications
Components used Short-
circuit
current
rating
(SCCR)
Total
Ambient conditions
Article No. Description Max.
rated
current Ie
Rated
voltage Ue
Busbar
dimen-
sions
Rated current
of the fuse
used Ie
Fuse type used Max. spac-
ing of busbar
supports
kA A V A mm
8US1921-1AA00 Connection terminal plate with cover,
conductor cross-section
35 … 120 mm2
10 -- 600 -- -- -- 533
8US1921-1AA00 65 400 480 -- 400 3VL-UL; 3RV.7; 3RV.8 800
8US1921-1AA00 50 600 480 -- 600 3VL-UL; 3RV.7; 3RV.8 800
8US1921-1AA00 35 400 600 -- 400 3VL-UL; 3RV.7; 3RV.8 800
8US1921-1AA00 35 600 600 -- 600 3VL-UL; 3RV.7; 3RV.8 800
8US1921-1AA00 100 600 480 -- 600 J or T 800
8US1921-1AA00 100 500 600 -- 500 J or T 800
8US1921-1AA00 100 400 480 -- 400 RK1 800
8US1921-1AA00 100 400 600 -- 400 RK1 800
8US1922-2AA00 Cover profiles for busbars -- -- -- -- -- -- --
8US1922-2BA00 Cover profiles for busbars -- -- -- -- -- -- --
8US1922-2DA00 Cover profiles for flat copper profile -- -- -- -- -- -- --
8US1923-3UA01 End and intermediate holders for flat
copper profiles
18 150 600 12x5 -- -- 250
8US1923-3UA01 18 150 600 12x5 -- -- 400
8US1923-3UA01 65 150 480 12x5 250 3VL-UL; 3RV.7; 3RV.8 800
8US1923-3UA01 25 150 600 12x5 250 3VL-UL; 3RV.7; 3RV.8 800
8US1923-3UA01 100 150 480 12x5 400 RK1, J or T 800
8US1923-3UA01 100 150 600 12x5 175 J or T 800
8US1923-3UA01 100 150 600 12x5 100 RK1 800
8US1923-3UA01 18 150 600 12x10 -- - 250
8US1923-3UA01 18 150 600 12x10 -- - 400
8US1923-3UA01 65 150 480 12x10 250 3VL-UL; 3RV.7; 3RV.8 800
8US1923-3UA01 25 150 600 12x10 250 3VL-UL; 3RV.7; 3RV.8 800
8US1923-3UA01 100 150 480 12x10 400 RK1, J or T 800
8US1923-3UA01 100 150 600 12x10 175 J or T 800
8US1923-3UA01 100 150 600 12x10 100 RK1 800
8US1923-3UA01 18 362 600 20x5 -- - 250
8US1923-3UA01 18 362 600 20x5 -- - 400
8US1923-3UA01 65 362 480 20x5 400 3VL-UL; 3RV.7; 3RV.8 800
8US1923-3UA01 35 362 600 20x5 400 3VL-UL; 3RV.7; 3RV.8 800
8US1923-3UA01 100 362 480 20x5 500 J or T 800
8US1923-3UA01 100 362 600 20x5 400 J or T 800
8US1923-3UA01 100 362 480 20x5 400 RK1 800
8US1923-3UA01 100 362 600 20x5 200 RK1 800
8US1923-3UA01 18 564 600 20x10 -- - 250
8US1923-3UA01 18 564 600 20x10 -- - 400
8US1923-3UA01 65 564 480 20x10 400 3VL-UL; 3RV.7; 3RV.8 800
8US1923-3UA01 35 564 600 20x10 400 3VL-UL; 3RV.7; 3RV.8 800
8US1923-3UA01 100 564 480 20x10 500 J or T 800
8US1923-3UA01 100 564 600 20x10 400 J or T 800
8US1923-3UA01 100 564 480 20x10 400 RK1 800
8US1923-3UA01 100 564 600 20x10 200 RK1 800
8US1923-3UA01 25 500 600 30x5 -- - 250
8US1923-3UA01 22 500 600 30x5 -- - 400
8US1923-3UA01 65 500 480 30x5 400 3VL-UL; 3RV.7; 3RV.8 800
8US1923-3UA01 35 500 600 30x5 600 3VL-UL; 3RV.7; 3RV.8 800
© Siemens AG 2014