CE marking and CB certificate are completely different topics:
The
CE marking
is a self-declaration by the manufacturer that its products comply with all applicable legal requirements of the European market. The manufacturer or its representative located in the European Union applies the CE marking and thus declares in full responsibility that the product complies with all relevant requirements of EU law or European directives.
In the context of the CB procedure, a certification body acts as an independent third party to check whether the electrotechnical product complies with the applicable and published IEC standards.