Phoenix Contact has modified the mounting flange with additional plastic ribs, and additional radiuses for the reinforcing ribs on the front side. Dimensions and technical data will still remain the same. Both versions may be offered during the transition period depending on current inventory. This change will be effective on or around October 2012. Part Numbers Affected: 651-1932494 651-1932504 651-1932520 651-1932546 651-1932575 Please contact a Mouser Technical Sales Representative for further information. 5-0612-6