Siemens Sentron 3VA Manual page 58

Description
2.4 Standards and guidelines
Note
In addition to the clearances stated above, any insulating equipment that might be required
must also be considered, see chapter Insulating equipment (Page 203).
If the molded case circuit breaker is installed in a system whose connection type and
operational voltage does not correspond to the specified insulation measures, a type test is
required.
It must be ensured that the cable or busbar connection does not reduce the through-air
insulation clearance.
Additional insulation measures such as long terminal covers or phase barriers can increase
the width or height of the molded case circuit breaker. In this case the minimum clearances
apply from the corresponding sides of the overall molded case circuit breaker/insulation
measure combination.
NOTICE
Damage to the molded case circuit breaker and the system
Depending on the application, larger minimum clearances may be necessary.
Note the specifications regarding air and creepage distances in the applicable overriding
IEC 61439 standards "Switchgear and controlgear assemblies" as well as the applicable
UL standards and local installation and application codes.
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3VA molded case circuit breakers with UL and IEC certification
Manual, 01/2019, L1V30435333-01