SPDee DC  DC Voltage Surge Protector

The Industry’s first and only UL 1449 Listed as DC Surge Protective Device (SPD) for use in Photovoltaic applications

Presently, there is no dedicated UL standard for higher voltage DC Surge Protection Devices (SPDs). The following SPDees comply with most recent regulatory actions including UL 1449 Third Edition Listing (VZCA.E321351) and compliance to the UL Certification Requirement Decision (CRD) regarding DC rated Surge Protective Devices (SPDs) for Photovoltaic Systems.


  • UL Listed to UL 1449-3 Photovoltaic Standard - (VZCA.E321351 & VZCA7.E321351)
  • UL 1449 tested SCCR: 100kA DC
  • UL 1449 tested In: 20kA (highest available)
  • Type 1 Surge Protection Device (SPD) – All UL required OCP & Safety Coordination included inside and can be installed line-side or load-side of main disconnect
  • UL 96A Lightning Protection Master Label eligible
  • Large-Block arrestor-grade 34mm square MOVs
  • Individually Fused & Thermally Protected MOVs
  • Phase Loss Monitoring (toggles LED & Dry Contacts)
  • Standard NEMA 4X Polycarbonate Enclosure
  • Tri-Mount Installation Kit Included (Pipe Nipple, Bracket, Din-Rail)
  • Voltage Specific Design – Highly configurable
  • All MOV suppression elements monitored


  • 2 Year Warranty (longer optional)
  • Burn-in Tested Prior to Shipment


  • Audible Alarm with Dry Contacts
  • Available Z Mounting Bracket Accessory (pictured above)


  • Solar PV Inverters
  • Solar PV Combiner Boxes
SPDee surge protector

S50A300VDCPV, S50A600VDCPV, S50A1000VDCPV, S50A300VDC, S50A600VDC, S50A1000VDC
Divisions of APT:
Whole House Surge Protector
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