Nope, not DIN mounted. They looked just like the "chocolate blocks" except they had a central metal strip connecting all the terminals (both sides - the whole block was a common connection). Great for securing with a few splodges of hot glue!

Edited to add: unless it was a very tiny DIN rail, or memory has made them shrink. I remember having to hold them up to the light to check I wasn't using the single-pole versions by mistake so they must have looked quite similar.