John Rumm wrote:

Although incomplete, an early stab at an interchange chart is available
here. Note the chart is incomplete - just because there is no X in a box
does not mean that it won't fit!


http://wiki.diyfaq.org.uk/index.php?...hangea bility

I have a Siemens Stratum CU for which it's now well nigh impossible to get
parts. Hager RCBO's fit this box and appear to work without any problems.
Perhaps it would be worth adding this to your list for the benefit of
anyone else unfortunate to have one of these rare CU's.

--
Mike Clarke