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BETA Protecting
SR60 Busbar Systems
Distribution board components
5/7
Siemens ET B1 · 10/2008
5
■
Dimensional drawings
■
More information
Material properties
Busbar supports and busbar-mounting fuse bases
(
see "Built-in
components" on page 5/9 ff.)
are manufactured from glass-fiber
reinforced, thermoplastic polyester (color RAL 7035, light gray).
The material ensures excellent mechanical, chemical and electrical
properties. Furthermore, the material has an extremely low flam-
mability and meets the requirements of UL 94 V0. This satisfies
the load requirements of the busbar supports at rated operational
voltage 500 V and rated currents at 200 A to 630 A, as well as
the rated short-circuit strength 50 kA.
Ambient temperatures
When dimensioning the busbars based on rated currents, the
ambient temperature and the Cu busbar temperature must also
be taken into account.
The location of the busbar system and its ability to dissipate heat
through convection also play a key role in this calculation.
Because conditions can vary for each distribution board, the
values in the following table serve as a guideline only. However,
they must be applied to the entire busbar length.
Continuous currents depending on the Cu power rail dimensions and Cu busbar temperatures
at 35°C ambient temperature
8
GK9 busbar support
N/PE busbar support
Connection module
8
GK9 711-0KK03
5
SH3 540
5
SH5 538
Connection module
Connection module
Connection module
8
US19 21-1AA00 shown closed
8
US19 21-1AA00 shown open
8
US19 21-1BA00
A
A
5
49,5
30,5
191
20
NSE0_01568a
60
60
SECTION: A-A
6,5 15
65
4
Nm
49,5
50
33
36,5
I2_14000a
20
20
28
60
34
60
32
200
194
I2_13999a
I2_07150a
84
20
55
70
200
189
60
60
200
31
46
80
84
175
I2_06439b
55
200
194
54
60
94
60
32
NSE0_01598
Cu busbar dimensions
H × D
Continuous current for open busbar run
Ambient temperature 35 °C
Continuous current of fuse link
Operational class gL/gG
mm × mm
A
A
12
× 5
200
200
12
× 10
360
315
15
× 5
250
250
15
× 10
447
400
20
× 5
320
315
20
× 10
520
500
25
× 5
400
400
25
× 10
580
500
30
× 5
447
400
30
× 10
630
630
As far as other types of upstream protective devices are concerned, please observe the permissible continuous current of the busbar.
© Siemens AG 2008