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OVRHTP Surge Protective Devices (SPDs) is a cost-effective solution designed for UL panel builders and original equipment manufacturers OEMs to help protect against utility power anomalies and lightning-induced transient surge conditions. OVRHTP compact and advanced design feature thermally protected MOVs to eliminate overvoltage, safeguarding your equipment and capital investments.

Key Benefits

  • Safeguard capital investments – Help protect your customers' valuable assets, reduce downtime, and lower maintenance costs
  • Cost-effective – Choose the enclosure options that better fit your budget
  • Competitive lead times – Manufactured within the US, helping you secure more projects and deliver your projects faster
  • Made to order – Meet the technical specifications of each of your different projects
  • Absolute protection - Advanced thermal protection for a higher level of reliability

Key Features

  • Thermally protected MOVs
  • Multiple enclosure options: Metal and polycarbonate
  • Compact and lightweight design
  • Standard monitoring status indicator lights (one per phase)
  • Dry relay contacts report SPD status remotely
  • Optional surge counter display
  • Optional audible alarm with a silence button

Technical Specifications

  • 200kAIC short circuit rating for most available voltage configurations
  • Maximum surge current rating 60 kA to 400kA per phase, 30 kA to 200kA per mode
  • Nominal discharge current rating (I-n) 20kA for most available configurations
  • Operating frequency 47–63Hz
  • Connection method parallel to the electrical distribution system
  • Modes of protection All Modes (L-N, L-G, N-G, L-L)
  • Type 1 SPD with fault current rating (SCCR) 200kAIC – no upstream over-current protection device (breaker or fuse) required

Certification & Standards

  • UL Listed 1449 4th edition for Type 1 and Type 2 SPD applications
  • Type 1 SPDs meet requirements for UL 96A
  • UL 1283 for Type 2 applications
  • IEEE C62.41.1, .2, C62.45
  • ROHs compliant


  • 10-year warranty


  • Data centers – uninterrupted power supplies, remote power panels
  • Food and beverage
  • Wastewater treatment plants
  • Motor control centers
  • Service entrance
  • Power distribution
  • Control cabinets
  • Lighting circuits
  • HVAC equipment
  • UL508A control panels


Downloadable Resources

NEMA OVRHTP-060 Datasheet

NEMA OVRHTP-080 Datasheet

NEMA OVRHTP-100 Datasheet

NEMA OVRHTP-120 Datasheet

NEMA OVRHTP-160 Datasheet

NEMA OVRHTP-200 Datasheet

NEMA OVRHTP-240 Datasheet

NEMA OVRHTP-300 Datasheet

NEMA OVRHTP-400 Datasheet

OVRHTP SPDs Release notes