Siemens Sentron 3VA Manual page 173

Cables and busbars: Busbars
In addition to cables, the busbar is also widely used in electrical connections, especially in
panels.
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 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.
3VA molded case circuit breakers with UL and IEC certification
Manual, 01/2019, L1V30435333-01
Accessories
4.3 Connection system
171