Siemens 3VA1 100 A Manual page 168

Accessories
4.3 Connection system
Cables and busbars: Busbars
In addition to cables, the busbar is also widely used in electrical connections, especially in
cubicles.
Some of the reasons for using busbars include:
● High-curvature bending radii which are unsuitable for cables of large cross section
● Lack of space
● Heat dissipation, air circulation
● ...
Rigid and in some cases flexible busbars are used in the examples of applications listed
above.
Rigid busbars are made of copper or aluminum. Pre-punched aluminum busbars, some of
which are threaded, are often used.
Flexible busbars are chosen for applications which demand a high degree of flexibility and
high-curvature bending radii. These consist of bundles of copper or aluminum strips.
168
3VA molded case circuit breakers
Manual, 04/2015, A5E03603177010-02