Hi, These miniature RCBOs fit all Wylex consumer units with a Flexible busbar and the newer Wylex NM and NMX ranges of consumer units that do not have the old style Fixed Balcony busbar. They do not fit the older style consumer units with the Fixed Balcony busbar. Thanks for your interest in Wylex products.
Answered by: Wylex Expert
Date published: 2019-08-11