Before you click on a suspicious "free download" link, check ABB's official site for the 13th edition (which is free to view online). If you need the specific content of the 12th, buy a used physical copy and digitize it legally. Your computer’s security and your professional ethics are worth the price.
While many engineers look for free PDF downloads, it is important to note that the ABB Switchgear Manual is a proprietary technical document. ABB Switchgear Manual 12 Ed pdf