The Littelfuse LST Varistor Series is constructed with Littelfuse renowned thermally protected varistor technology (TMOV). The built-in thermal disconnecting function and electric arc shield provides additional protection to prevent catastrophic failure and fire hazard even under the extreme circumstances of varistor end-of-life or abnormal overvoltage conditions. It is specifically designed for Type 1 and Type 2 Surge Protective Devices (SPDs).

200 kA SCCR, 20 kA In, UL1449 Type 4 recognized
component assembly
Same footprint and PCB layout for Imax 50 kA and
75 kA options
Mechanically triggered AC and DC rated micro-switch with
Normally Open or Normally Closed options for remote
indication/monitoring circuit
Visual tab option to display LST working status
RoHS compliant, Lead-free, and Halogen-free