Siemens 3VA1 100 A Manual page 357

Summation current transformer
Summation current transformer 5SV8702-0KK (35 mm inside diameter)
Suitable summation current transformers
Depending on the rated operational current or maximum current of the circuit to be
monitored, the following summation current transformers can be used:
Alignment of conductors in the summation current transformer
In order to prevent measurement errors or spurious tripping, it is important to ensure that the
conductors are properly aligned or arranged in the summation current transformer.
Note
The summation current transformer used for the application must have an inside diameter
which is at least 1.5 times larger than the outside diameter of the conductors which pass
through it.
3VA molded case circuit breakers
Manual, 04/2015, A5E03603177010-02
Accessories
4.8 Residual current devices
357