Low-voltage electrical distribution board in which the consumer switches can be plugged, by means of the interposition of modular support adapters, into the distribution bars which can be accessed through openings distributed as a modular reticle in an interposed insulating panel. The respective switch/adapter units have connection tags which allow clamp-like releasable coupling to the distribution bars. The handling of the switch/adapter units is facilitated by handles, one of which is removable.