Welcome to the ASCO Website

Welcome to our website.

You can choose another country to view available products or go to our Global website for company information.


ASCO Model 135 (Edco H Series) Surge Protective Device

Low Voltage DC | 0.160kA

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.

ASCO Model 135 (Edco H Series) Surge Protective Device
  • Features

    • 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
    • 5 Year Warranty


    • Education
    • Fire/Alarm/Security
    • Healthcare
    • Manufacturing
    • Telecom
    • Transportation