The unit protects the 400 V LV line.
The unit is selected as a function of the rating of the upstream TPC type transformer.
Depending on customer connections, you have a choice of:
• a single output unit with 1 protection, for ratings from 50 kVA to 100 kVA,
• a dual output unit with 2 protections, for ratings from 100 kVA to 160 kVA.