ASCO Model 231 (Edco SPA-303) Surge Protective Device

The ASCO Model 231 (Edco SPA-303) is a three circuit Surge Protective Device intended for use on traffic control load relay outputs. The Model 231 is furnished with three leads and a ground stud.


  • Convenient mounting/grounding stud
  • Compact size


  • 5 Year Warranty

Technical Specifications