ASCO Model 135 (Edco H Series) Surge Protective Device

The ASCO Model 135 modules are ultra high speed fused solid state dual listed Primary (UL 497) and Secondary (UL 497A) protectors for KEY/PABX systems. The units are available in Analog and Digital clamping voltages.Model 135 single pair modules fit onto a standard M1-50 split block and replace bridging clips. In addition, these modules require an ASCO MGBW Ground Rail accessory for each M1-50 block used.


  • Ultra High Speed Technology
  • Silicon Foldback Technology
  • Fits standard M1-50 phone block
  • Three clamping levels to fit application


  • Protection for Analog & Digital Extensions
  • Low Cost
  • Easy Installation 

Technical Specifications