Model OVP2 Over-Voltage Protector by Dairyland Electrical

Unlike other “arrester” type over-voltage products, the OVP2 uses solid-state switching components to conduct at very low voltages, providing the most reliable over-voltage protection available to the industry. The OVP2 is rated for AC fault current, and lightning, ensuring peak performance for the product’s long life vastly outperforming other protection products such as spark gap arresters and surge diverters. The OVP2 is UL and C-UL listed for use in Division 2 or ordinary locations, as well as CE marked as meeting the ATEX requirements for Zone 2. Note: the OVP2 is not suitable for applications where steady-state induced AC voltage exists between the connection points.

OVP2 Overview

The Over-Voltage Protector (OVP) design has been established since 1999 as the premier explosion-proof (Division 1) protection device for use on cathodically protected structures, using solid-state technology. Dairyland offers a variation of the OVP design in a molded housing, designated as the OVP2, for Division 2, Zone 2, or ordinary locations. The OVP2 package offers the same conservative design and features of the OVP, but in a lighter weight and lower cost package.

Features & Characteristics

  • The only fail-safe "arrester" on the market (i.e.. fails shorted).
  • Solid-state design eliminates arcing.
  • Conduction at much lower voltages than gapped arresters.
  • Rated for AC fault current and lightning surge current.
  • Suitable for submersed or above-ground locations.
  • UL, C-UL listed Div. 2 design, CE marked for ATEX compliance.
  • Corrosion-free, lightweight molded housing.


Typical Applications

  • Insulated Joint Protection
  • Airport Fueling Systems Isolation / Bonding
  • Decoupling Equipment Grounds

Dairyland's Zone 2 product lines (PCR, SSD and OVP2) have achieved IECEx certification.


Threshold Voltage (absolute)

  • -2/+2V (standard)
  • -3/+1V (optional)

Lightning Impulse Current

  • 100 kA crest (8 x 20 µs waveform)

Environmental rating:

  • IP-68 - Submersible to 2 m depth.

Hazardous (Classified) Areas:

  • ANSI/ISA: Class I, Division 2, Groups A, B, C, D
  • ATEX: Zone 2, Group IIC
  • IECEx: Zone 2, Group IIC
  • UKEx: Zone 2, Group IIC


AC Fault Current (Amperes - rms) @ 50/60 Hz
Cycles 1.2 kA 2 kA 3.7 kA 5kA

Model Number Description Chart

The OVP2 has been tested by Nationally Recognized Testing Laboratories (NRTLs) for compliance to independent standards in its operation, ratings, and construction. This includes compliance to standards for:


  • Effective Ground Fault Current Path per:
    • NFPA 70 (US National Electric Code – NEC): Article 250.4(A)(5)
    • CSA C22.1 (Canadian Electric Code, Part I): 10-100 & 10-500
  • Isolation of Objectionable DC Ground Currents per:
    • NFPA 70: Article 250.6(E)
    • CSA C22.1: 10-100 & 10-500
  • Hazardous Location Use: Class 1, Division 2, Groups A, B,C,D by UL & C-UL per:
    • UL 121201, 9th Ed. and CSA C22.2 No.213-17
  • Hazardous Location Use: Class 1, Division 2, Groups A, B,C,D by UL & C-UL per:
    • UL 121201, 9th and CSA C22.2 No.213-17
  • Safety Requirements for Electrical Equipment per:
    • UL 61010-1, 3rd & CSA C22.2 No. 61010-1
    • Overvoltage Protection from Impulse (Lightning) Current: 100kA (8 x 20µs)
    • Enclosure Rating: IP68 (Submersible to 2 meters depth)7
    • Temperature Range: -45°C to +65°C (-49°F to +149°F)

Zone System: ATEX / IECEx / UKEx (Europe / International / UK). ATEX per directive 2014/34/EU (Equipment for use in Potentially Explosive Atmospheres):

  • Zone 2, Group IIC, Increased Safety “ec”
  • EN IEC 60079-0: 2018
  • EN IEC 60079-7: 2015+A1:2018
  • IEC 60079-0: 2017
  • IEC 60079-7: 2017
  • Overvoltage Protection from Impulse (Lightning) Current: 100kA (8 x 20µs)
  • Temperature Range: -45°C to +65°C
  • Enclosure Rating: IP68
(Size: 0.88 MB)
(Size: 0.87 MB)