The AEC principle allows direct parallel connection between lightning and surge voltage protectors. As standard solutions for 230 V power grids, Phoenix Contact provides Powerset BC/3 for four-conductor systems and Powerset BC/3+1 for five-conductor systems.
AEC-principle systems are suited to installation in residential buildings and facilities at risk of lightning strikes where the space is not available to separate the lightning and surge voltage protectors with 10 m of wire decoupling the two protective elements.
Depending on the model, the triggered FLT/CTRL lightning protectors will operate as soon as voltages reach between 900 V and 2.5 kV. C varistor-based protectors with a suitable nominal conductor voltage are then directly connected in parallel to these B protectors.
Where dangerous current arise, the voltage increases across the C protector's varistor. When the response voltage of the B protector's trigger electronics is reached, the spark gap in the B protector, which is connected in parallel, fires. The lightning current now flows through the spark gap, relieving the C protector.
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