Accessories
4.3 Connection system
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03
211
The chapter "Connection technology" contains useful information and provides a
summarized description of the 3VA connection system. It provides a helpful guide to
connecting cables or busbars to a molded case circuit breaker and so helps to ensure the
safety of personnel and material assets. Mistakes which affect the operational safety of
electrical installations can be avoided.
The chapter discusses the following topics:
● General information about cables and busbars
● Portfolio of connection components for 3VA molded case circuit breakers with
– Front cable connection
– Front busbar connection / cable lug connection
– Rear busbar connection / cable lug connection
● Further connection accessories
General information about cables and busbars
Cables and busbars: Cables
Cable designation and cable classes
A key design feature of a cable is its flexibility. This is primarily determined by the number of
cores inside the cable.
Cable classes as defined by IEC 60228:
Class 1 - cable with solid conductor
Class 2 - cable with stranded conductors
Class 5 - cable with finely stranded conductors
Class 6 - cable with a large number of extra finely stranded conductors
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