ASCO Model 157 (Edco SS64 & SS65) Surge Protective Device

The ASCO Model 157 Surge Protective Device is designed for the water and wastewater industry. These multi-stage hybrid suppressors address over-voltage transients with gas tube and silicon avalanche technology. In addition, sneak and fault currents are mitigated with PTC devices which consist of solid-state resettable fuses.


  • Transient protection for low-voltage signal lines
  • Sneak/fault current protection
  • Resettable fusing—PTCs
  • Differential and common mode protection
  • Automatic recovery


  • Encapsulated in stainless steel pipe nipples
  • Protection for one pair, (Two wires and shield on 3/4”)
  • 5 Year Warranty