Skip to the beginning of the images gallery

Model OVP Over-Voltage Protector by Dairyland Electrical

Farwest is a stocking distributor for the full line of Dairyland (DEI) line of products and equipment.

The Over-Voltage Protector (OVP) is a solid-state device primarily designed to provide over-voltage protection from lightning and AC fault current in isolated joint applications; however, it also addresses many other cathodic protection applications. It also serves as an effective grounding (or coupling) path if the voltage across its terminals attempts to exceed a predetermined value selectable from 1.0 to 4.0 volts.

The OVP functions as an AC and DC isolation device (i.e., it prevents the flow of both DC and AC current) up to a predetermined voltage blocking level and as an effective grounding (or coupling) path when the voltage attempts to exceed this level. If the voltage attempts to exceed the voltage blocking level selected, the device immediately begins to clamp (i.e., limit) the voltage by allowing current to readily flow between its two connection points.

The OVP should only be used where the steady-state DC voltage plus the peak AC voltage (if any AC voltage is present) is less than the blocking voltage selected; other-wise AC rectification will occur, possibly affecting cathodic protection levels. Where over-voltage protection is required and induced AC voltage is present, it is recommended that PCR, PCRH, or SSD models be used because these can con-duct AC current while blocking the flow of DC current.

Description

OVP Overview

Designed to address needs for an explosion-proof protection device, the OVP line of products uses solid-state switching components to conduct at very low voltages, providing the most reliable over-voltage protection available to the industry. The OVP is rated for AC fault current and lightning, ensuring peak performance for the product’s long life outperforming other protection products such as spark gap arresters and surge diverters. The OVP was designed and has been tested to meet the requirements for Class I, Division 1 & 2, Group B, C, D classified locations in North America, and for Zone 1 requirements internationally. The model OVP is primarily used in Class I, Division 1 hazardous locations, requiring explosion-proof construction.
The OVP was designed and has been tested to meet the requirements for Class I, Division 1 & 2, Group B, C, D classified locations in North America, and for Zone 1 requirements internationally. The model OVP is primarily used in Class I, Division 1 hazardous locations, requiring explosion-proof construction.

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

Technical Specifications

Specifications

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
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

AC Fault Current (Amperes - rms)
Cycles	50/60Hz
1	6,500
3	5,000
10	4,200
30	3,700

Model Number Description Chart

Certifications

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
CSA C22.1: 10-100 & 10-500

Hazardous Location Use: Class 1, Division 1 & 2, Groups B, C, D by UL & C-UL per:

UL 1203, 5th Ed. and CSA C22.2 No.213-17

Safety Requirements for Electrical Equipment per:

UL 61010-1, 3rd Ed. & CSA C22.2 No. 61010-1, 3rd Ed.
Overvoltage Protection from Impulse (Lightning) Current: 100kA (8 x 20µs)
Enclosure Rating: NEMA 6P
Temperature Range: -45°C to +85°C (-49°F to +185°F)

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

Zone 1, Group IIB, Flameproof "db"
EN IEC 60079-0: 2018
EN 60079-1: 2014
IEC 60079-0: 2017
IEC 60079-1: 2014 - 06
Overvoltage Protection from Impulse (Lightning) Current: 100kA (8 x 20µs)
Temperature Range: -20°C to +60°C
Enclosure Rating: IP68

EAC: Russia, Kazakhstan, etc. by NANIO-CCVE:

Zone 1, Group IIB, Flameproof "d"
GOST 31610.0-2014 (IEC 60079-0:2011)
GOST IEC 60079-1-2011
Temperature Range: -45°C to +85°C

Accessories

A variety of accessories are available for the OVP, much like other Dairyland decoupling products. For more information and pricing, contact a Farwest representative today.