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The OVRHS3U surge protective devices shield sensitive electronic equipment against the damaging effects of transients caused by lightning, utility load switching, internal load switching, and more. The OVRHS3U is 40kA per phase, UL 1449 4th Edition listed for Type 1 or Type 2 SPD and is suitable for 400 A and below applications.  The OVRHS3U features individual fusing and thermal disconnection per metal oxide varistor (MOV) that ensures maximum performance and safe operation. An LED light indicates proper functioning of the device and an optional dry contact could be used for remotely monitoring SPD functionality. The OVRHS3U comes pre-wired with 18 inches of lead length allowing for easy installation.

OVRHS3U ideal for indoor use in sub-distribution and point-of-use applications like UL 508 panelboards, control boxes.


  • Application versatility
  • Robust and compact design
  • Pre-wired pigtail for ease of installation
  • No overvoltage protection required


  • Listed to UL1449 4th Edition for Type 1 or Type 2 SPD applications
  • Individual fusing for each metal oxide varistor (MOV)
  • LED indicating proper functioning of L-N and N-G MOVs
  • Pre-wired with 18" cables #14 AWG 
  • 3-year standard warranty 
  • Optional dry relay contact 

Standards, Certifications & Classifications

  • UL 1449 4th edition Type 1 and Type 2
  • UL 1283 Only for OVRHS3U802402SR
  • IEEE C62.41.1, .2, C62.45


  • UL 508 panel builders
  • Control boxes
  • UPS
  • ATS switches