The DD series power entry modules all offer a 2-pole power switch, 1- or 2-pole 5 x 20mm fuseholder, and either quick-connect or PCB terminals for convenience and ease of installation.  The DD11 and DD21 offer the option of this functionality without EMI/RFI filtering for those applications that don’t require it while the DD12 and DD22 feature compact but effective EMI/RFI filtering in addition to the functionality mentioned above.