When an infeed line with medium voltage is chosen, dimensioning is also performed for the fuse/circuit-breaker upstream of the transformer and the associated cable.

Transformers and generators can be mapped in a voltage range of 3 to 40.5 kV. Dimensioning is performed automatically for the integrated default values which can be selected from the drop-down menu in the Properties window. In case your project requires specific power ratings or voltages, you can enter these values manually. To do so, select the transformer/generator in the network diagram, right-click your selection to call up the Properties dialog and change the "Manufacturer" data field to "Any entry" so that you can then enter the technical data as desired.

It must be kept in mind that this is a combination of switchgear and protective device. To this end Simaris design contains a specific type of switchgear (8DJH).  Protection is rated dependent on the selected switchgear. Different protective devices may also be chosen manually. Proper implementation in practice is up to the planning engineer, whose responsibility is emphasized accordingly in the software.

With regard to the medium voltage level, SIMARIS design only dimensions the transformer outgoing feeders. These feeders are also included in the selectivity evaluation.

Circuit-breaker type L1.1: vacuum circuit-breaker, SI-capable, Ir = 10,000 / M2, ISC = 25 or 50

Circuit-breaker type L2:  vacuum circuit-breaker, not SI-capable, Ir = 2,000 / M1, ISC = 6 or 20

Legend: SI = short interruption; Ir = number of interruptions (break operations); ISC = number of short-circuit interruptions