It's a Canadian panel, 123. By code, we require a separate "service box" for the main disconnecting means. The barrier satisfies the requirement for a service box. All our panels come barriered.Can you provide a part number for that removable plate shown in the pic (installs over the service entrance conductors). I have asked our square D rep for it and no dice. Would make cutting/ or adding circuits in live panels much safer. Shoot me a private message if need be as this is a bit off topic and will be piced apart and cut to pieces here.
By the look of it, our panels are alike except for the barrier. Square D might be able to order it for you as a separate Canadian part but it would be an unusual request, even for us up here in the frozen north.