That is a breaker line (3VF) that, although it is UL listed, is not marketed by Siemens USA or Canada, except as replacement parts for OEM equipment that comes from Germany. Here in North America, that 125A frame product like this is the EDG line, which is brand-labeled from Eaton. The reason is simply that Siemens USA and Canada can buy and brand label that breaker from Eaton cheaper than they can import that 3VF breaker from Germany.
If you have to replace one with an exact, be prepared for a 10-12 week lead time, they are not stocked here.