Primary distribution switchboards (Power Center)
Such switchboards, comprising one or more input units, possible busbar couplers and a relatively small number of output units, are generally installed immediately downstream of MV/LV transformers or generators.

The type of construction corresponds to a cabinet having a metal casing and compartments divided into several selective-access cells with forms of segregation from 1 to 4.
The structure is sturdy so as to withstand electrodynamic stresses and the weight of large equipment.
Distinctive features of power centers are, in fact, high values of rated and short-circuit currents.