Catalog LV 70 2011 - Low & Medium Voltage - Siemens

© Siemens AG 2011
BD2 System — 160 ... 1250 A
Max. length/height of vertical BD2 busbar lines,
supported by one BD2-BWV or BD2-BDV retaining element
BD2A-.-...
Rated current A 160 250 400 630 800 1000 1250
Max. supported length or height
m 11.3 10.9 7.9 5.8 5.8 5.3 –
at max. load (see below)
Max. weight per 3.25 m trunking unit
fitted with tap-off units
kg 50 53 74 106 108 108 –
Configuration information
BD2C-.-...
Rated current A 160 250 400 630 800 1000 1250
Max. supported length or height
m 10.0 9.9 7.2 5.2 4.8 4.1 3.25
at max. load (see below)
Max. weight per 3.25 m trunking unit
fitted with tap-off units
kg 50 53 74 106 108 108 108
Notes
For taller BD2 busbar lines, additional mountings must be used.
■ Function
The maximum load applied to the BD2-BWV and BD2-BDV vertical
retaining elements must not exceed 175 kg. They must be
fitted in the area of the terminal.
Overload and short-circuit protection
Busbar trunking systems need to be protected against short-circuits
and overloads. Fuses and circuit breakers are available for
use as protective devices. With the selection of this protection
equipment the level of the expected short-circuit currents, selectivity
requirements or operating and signaling functions are also
factors for consideration.
If circuit-breakers are used, the thermally delayed overload release
is set to the rated current value for the busbar trunking system.
This means that the busbar trunking system can be 100 %
loaded.
When you decide on your short-circuit protection via fuses and
circuit-breakers you must not exceed the specified short-circuit
ratings of the busbar trunking systems.
It depends on the level of expected short-circuit current, whether
a current limiting protective device is required and what shortcircuit
breaking capacity the protective device must have.
The table below contains an overview of the circuit breakers
which are suitable for short-circuit and overload protection
(400 V and 50 Hz) of the corresponding busbar system.
The following applies:
I’’ k ≤ I cc ≤ I cu
with
I’’ k = the expected short-circuit current at the site of installation
I cc = rated conditional short-circuit current
of the busbar trunking system
I cu = rated short-circuit breaking capacity
of the circuit breaker
Type Rated current Circuit breaker
with normal
switching
Rated conditional
short-circuit
current
Circuit breaker
with medium
switching
Rated conditional
short-circuit
current
Circuit breaker
with high
switching
Rated conditional
short-circuit
current
capacity
capacity
capacity
I n I cu I cc
I cu I cc
I cu I cc
A
kA kA
kA kA
kA kA
BD2A(C)-160 160 3VL27 16-1... 40 20 3VL27 16-2... 70 20 3VL27 16-3... 100 20
BD2A(C)-250 250 3VL37 25-1... 40 40 3VL37 25-2... 70 50 3VL37 25-3... 100 50
BD2A(C)-400 400 3VL47 40-1... 45 45 3VL47 40-2... 70 45 3VL47 40-3... 100 45
BD2A(C)-630 630 3VL57 63-1DC36 45 45 3VL57 63-2DC36 70 70 3VL57 63-3DC36 100 100
BD2A(C)-800 800 3VL57 80-1SE36 50 50 3VL57 80-2SE36 70 70 3VL57 80-3SE36 100 100
BD2A(C)-1000 1000 3VL77 10-1SE36 50 50 3VL77 10-2SE36 70 60 3VL77 10-3SE36 100 60
BD2C-1250 1250 3VL77 12-1SE36 50 50 3VL77 12-2SE36 70 60 3VL77 12-3SE36 100 60
5
The values for the conditional rated short-circuit current I cc
apply to the busbar trunking systems without consideration of
any tap-off units.
Siemens LV 70 · 04/2011
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