TOPJOB®S main distribution set FI/LS, for the main distribution with separate FI/LS switches for each circuit, includes all the components required for wiring a feed-in and connecting 14 alternating current and 2 three-phase circuits, connection of the L and N lines from the FI-LS switch to the circuits via installation level terminals without the option of disconnecting, separation of the N potentials for insulation resistance measurement via the FILS switches.