ASCO Model 425 Surge Protective Device

ASCO Model 425 Surge Protective Device | FrontView

The ASCO Model 425 Surge Protective Device uses thermally protected MOVs, is designed in a NEMA 4X enclosure, and is tested as a UL 1449 Type 1 device, so it can be placed on the line or load side of the main disconnect.


  • UL 1449 Fourth Edition Listed
  • 50kA per mode/100kA per phase rating
  • All UL required OCP & Safety Coordination included inside— Type 1 SPDs intended for Line or Load Side of Main Disconnect— Type 2 SPDs intended for Load Side of Main Disconnect
  • 20kA Inominal


  • 200kA SCCR
  • UL 96A Lightning Protection Master Label compliant (@20kA IN)
  • Voltage Specific Design — Highly configurable
  • All MOV suppression elements monitored
  • NEMA 4X Indoor/Outdoor rated enclosure
  • All Modes of Protection
  • 10 Year Warranty

Specification Documentation


Other Documents