Just to further renosteinke's comment.
The SUSE labeling does in fact mean that the switch must be rated for whatever the PoCo's available fault current level is, you will need to find that out before you purchase it to be certain. For an industrial/commercial site that can be high compared to a residential site, that's why the price is higher. You probably will not need it to be that high, but even so you will still need that SUSE label if you connect it as you have indicated, and the ATS manufacturers (those that even offer SUSE labels because not all do) only make them for the larger market so you may be stuck with the spendier ones.
