E52-P20AYD6.4NETU2M E52-P20AYD6.4NETU4M E52-P20AYD6.4NETU8M E52-P20B D=8 E52-P20B-N D=8 E52-P20B-ND8 E52-P20C E52-P20C D=3.2 E52-P20C D=4.8 E52-P20C D=6.4