LST Varistors with Littelfuse TMOV Technology Make Surge Protection Devices More Reliable

     Littelfuse, Inc announces the launch of the LST Varistor Series. Using proprietary thermally protected varistor technology (TMOV) developed by Littelfuse, this new varistor combines built-in thermal disconnect and arc shielding. This combination provides additional reliable protection against catastrophic failure and fire hazards even under abnormal overvoltage conditions or extreme end-of-life varistor situations.

     "LST varistors offer many advantages over other technologies on the market," said Boris Golubovic, vice president of marketing and strategy at Littelfuse. "By integrating LST into the latest designs, not only do they have a wider operating voltage range, higher Inrush current ratings, and to complement the micro switch options, your SPD will also become more reliable and meet the protection requirements of your customer's application."

     The LST Varistor series facilitates meeting UL1449 listed Type 1 or Type 2 standards by employing 200 kA SCCR, 20 kA In, UL1449 Type 4 certified components. Flexibility to use devices rated at 50 kA and 75 kA Imax (same footprint on PCB). Provides additional options for designing/monitoring SPD products or systems remotely via mechanically actuated AC and DC rated microswitches (NO/NC, lead length, 2-pin/3-pin/no-pin). Visual tab clearly shows LST operating status, which informs service technicians and maintenance engineers to replace LST at end of life (EOL) to continue to provide the best surge protection for the end product, wide operating voltage range: 50 kA models up to 690 Vac, 75 kA models up to 550 Vac.