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Over Voltage Protectors

Requests for a compact, explosion-proof protection device led to the design of the Over Voltage Protector (OVP). With the input of potential users and Dairyland's existing base of clients, the OVP was designed and tested to meet the requirements for Class I, Division 1 & 2, Group B, C, D classified locations. Independent testing and product listing was performed by Underwriter’s Laboratories (UL), authorizing the use of the UL and C-UL (Canada) marks. The device has also been tested and approved by UL/Demko for compliance to the ATEX directive for Zone 2 applications, and carries the CE mark for Zone 2.

The OVP is unlike other "arrester" type products. Instead of a gapped design, the OVP uses solid-state switching components to conduct at very low voltages, providing the best over-voltage protection. Rated for AC fault current as well as high values of lightning surge current, the OVP can be applied to sites where a spark-gap arrester or metal oxide varistor would be inappropriate. The OVP is a totally unique product for the corrosion prevention industry.

Note: the OVP is not recommended where steady-state AC voltage exists between the connection points, typically induced AC voltage.

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 explosion-proof design.
  • Corrosion resistant nickel finish.

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


Threshold Voltage (absolute)
-3/+1V (standard)
-2/+2V (standard)
Up to -4/+4V (optional)

Lightning Surge Current
100 kA crest (8 x 20 µs waveform)

Environmental rating: NEMA 6P – submersible
(Tested to IP54 per EN50021, but effective for service to IP68)

Hazardous (classified) areas:
Per NEC, CSA: Class I, Division 1 & 2, Groups A, B, C, D
Per EN50021: Zone 2

Third-party listings & approvals:
Underwriter's Laboratories (UL)
Underwriter's Laboratories - Canada (C-UL)
CE Mark

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