Local Panel Surge Protectors The PT80 and PT40 “-BB” models offer a low cost local panel protection solution. The “-BB” suffix stands for “bare bones” – meaning we have eliminated some features that not all applications requre, and passed the savings on to you. The protection circuits are the same as the standard models, comprised of high peak surge current fuses and large thermally-protected varistors. The front panel LEDs quickly display the protection of the protector. These models may be used on service panels, small generators, transfer switches, or dedicated to a single piece of critical equipment or control panel.