ASCO Model 136 (Edco FAS-31XT) Surge Protective Device

The ASCO Model 136 SPDs are single pair telephone or data line protectors that implement advanced two-stage hybrid design.The Model 136 for Phone Systems is nearly identical to the Alarm System SPD except without the shorting bars. Protected equipment such as modems are plugged into female modular jack on the Model 136.


  • UL 497A listed
  • Line-to-line protection
  • Line-to-ground protection
  • Polyswitch resettable fuses - PTCs
  • 5 year warranty


  • <1 nanosecond response time
  • Low capacitance
  • Over current protection
  • Solid-state silicon break-over technology