ASCO Model 570 Surge Protective Device

ASCO Model 570 Surge Protective Device | FrontView

The ASCO 570 Surge Protective Device is a true hybrid, offering a coordinated multi-stage system of suppression, integrating the fast response time of the SAD (Silicon Avalanche Diode) modules with the high-energy capability of the MOV modules. Superior clamping at surge current ratings up to 375kA per mode or 750kA per phase.


  • Model 570 (Hybrid) builds upon the industry standard ASCO Model 560 surge protective device
  • Patented component level monitoring including neutral to ground
  • Unique sand-packed silver fuse network UL Rated at 200kAIC for safety
  • All surge suppression components used are computer tested and matched
  • SADs are matched to +/- 1% and MOVs are matched to 1 volt for optimum reliability and long life
  • Highest surge current capability and survivability in the industry
  • Built-in-test feature standard


  • True, coordinated multi-staged system of suppression
  • Lowest UL 1449 clamping voltages achieved
  • Smaller enclosure size allows an easier installation for hybrid system
  • Optional ASCO ASM (Active Surge Monitor), web-based power quality monitoring
  • 10 Years (on all parts)5 Years (on-site labor)

Specification Documentation



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