Wednesday, March 3, 2021

Littelfuse LST Series SPD Thermally Protected Varistor

The LST Varistor Series is constructed with Littelfuse’s 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).

FEATURES

  • 200kA SCCR, 20kA In, UL1449 Type 4 recognized component assembly.
  • Same footprint and PCB layout for Imax 50kA and 75kA 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.
BENEFITS

  • Facilitate meeting UL1449 listed Type 1 or Type 2 standards.
  • Same PCB layout/design for 50kA and 75kA Imax rated SPDs.
  • More flexibilities/options for designing an isolated remote indication/monitoring circuit. 
  • Clear indication for technician/engineer to replace EOL product to continue surge protection for the end product. 
  • Environment-friendly.

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