Surge-Trap® modular surge protective device (SPD) is a no fuse, fail safe surge suppressor featuring MERSEN patented TPMOV® technology inside. UL 1449 4th edition approved, it is DIN-rail mountable featuring a fail safe self-protected design, visual indicator and a small footprint. A remote indicator option provides status to critical control circuitry. The Surge-Trap® modular SPD has a high short circuit rating and a thermally protected MOV, which eliminates the need for additional overcurrent protection devices.