An electrical board for connecting two electrical harnesses to each other includes a module holder and at least one connector module to establish the connection between the two electrical harnesses, said connector module comprising a base engaged with the module holder, a perforated core extending the base and allowing connection of the two harnesses to each other via plugs. The module holder includes a fixed jaw, a movable jaw mounted to pivot on the fixed jaw, and locking means for holding the mobile jaw in the closed position.