I don’t know if they are marked with their rating because I have never removed one but I imagine they must have some identifying marks. Do you have a manual? It should tell you in there. There is one in the archive. You might want to email Jeremy (Rowley that is). He’s done quite a lot of electrical enhancements to his 35 Classic which I vaguely remember included replacing cct breakers.
The membership association for owners of Dufour Yachts