The dimension of 4FCC60 is
376mm (W) x 800mm (H) x 70mm (D) plus wall thicknessWall opening/Cut out is
765mm (H) x 335mm (W).
Please go to the website via the following links below and check under the Documentation Tab for more information.
https://www.clipsal.com/products/detail?CatNo=4FCC60&itemno=4FCC60-WE&backto=/search?q=4FCC60&tab-document-1=0
https://download.schneider-electric.com/files?p_Doc_Ref=HRB36910&p_File_Ext=.PDF (Page 2)