DI TE K’s ‘ 31X’ series of surge protectors are designed and built for professional alarm panel installers. The 1F 31X protects the power and telephone line and has a center screw to secure the transformer to the surge protector and the receptacle. The MRJ 31XSCP-WP is a universal “ plug and play” device that protects the dialer on the alarm panel from surges on the telephone line. The AC31X is a hardwire device that is used when the transformer is remote from the panel and protects 24 volt power and the telephone line to the dialer.