A little more news about the bimetal. G.RAU have confirmed that both the TB1577-AGE and -GE are indeed manufactured by them and that the TB1577-AGE is designed to meet DIN1715 TB1577A specifications.
However G.RAU mentioned that the TB1577-GE cross references to their part TB1577B-GE which sounds a little strange to me. I'm awaiting confirmation.
I'll attempt to download a copy of DIN 1715 again, but I'm struggling finding a freebie as I don't really want to spend out 60USD
Lea