Full faulty surge protection. UL, flammability rating: UL94-5V. NEMA 4X polycarbonate case. Optional twist lock plug lightning and surge suppression for AC power and low-voltage signal lines. Series hybrid AC suppressor/filter. Plug-in protection module. 15 A replaceable fuse. Test jacks for signal line monitoring. "Power On" indicator. Optional stainless steel or fiberglass enclosure.