Welcome to the SCHURTER DD Series Power Entry Module training. The SCHURTER DD series power entry modules have a lot to offer in their small packages. The panel-mount DD11 and DD12 provide unfiltered and filtered, fuse protected, switched AC power in one pre-wired unit at a reasonable price. The DD21 and DD22 are industry’s first power entry modules to provide this same functionality in a PCB-mount package.