Explosion-Proof Over-Voltage Protection


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Product Description

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.

Note: The OVP is not suitable for applications where steady-state induced AC voltage exists between the connection points.

UL Canada & United States
AC Fault Current (AMPERES-RMS) 50/60Hz
3.7kA at 30 cycles

Review the Technical Literature for full fault current tables.

Lightning Surge Current
100kA crest (8 x 20 ┬Ás waveform)
Environmental Rating
Threshold Voltage
-3/+1V (standard)
-2/+2V (standard)
up to -4/+4V (optional)
Hazardous (Classified) Areas
ANSI/ISA: Class I, Divisions 1 & 2, Groups B, C, D
ATEX: Zone 1 Group IIB+H2
IECEx: Zone 1 Group IIB+H2
EAC: Zone 1, Group IIB+H2
UKEx: Zone 1, Group IIB+H2

The OVP 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:

Class 1, Div. 1, Groups B, C D, and Zone 1, Group IIB + H2

Class & Division System: UL (United States) and C-UL (Canada)

  • 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 1 & 2, Groups B,C,D by UL & C-UL per:
    • UL 1203, 5th Ed. &- CSA C22.2 No.30, 3rd Ed.
  • 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, Gas Group IIB + H2, 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 KAZEXPOAUDIT

  • Zone 1, Gas Group IIB + H2, Flameproof “d”
  • GOST 31610.0-2019 (EN IEC 60079-0:2018)
  • GOST IEC 60079-1-2013
  • Temperature Range: -45°C to +85°C

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