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Haz-Pac Transformers for Perilous, Dangerous and Hazardous Locations

Hazardous Locations are well defined by the National Electric Code (NEC®) for good reason. Choosing the wrong transformer for use in perilous environments containing volatile gases, dust, liquids or fibers can lead to serious consequences.

Our Silica Resin Encapsulated Transformer is the result of many years of continuous refinement. The Haz-Pac™ product type was initially developed and expanded as a result of a growing need for a compact and economical dry type transformer that was impervious to harsh environmental conditions, such as those encountered in chemical plants, refineries, dairies, marinas, shipboard use and desert areas like those found in Saudi Arabia, Africa, South America, North America, Australia, Asia, etc.

Product durability, quiet operation, and flexibility in designing the encapsulated style transformer for your application are clear advantages offered by the Olsun brand. Olsun Electrics’ Haz-Pac transformer line is designed and built specifically for hazardous locations in compliance with article 500 of the NEC and is UL* listed for Class I, Division 2, Groups C and D locations. And with a North American Temperature Classification of T3C, Haz-Pac keeps its cool under load — when you and the surroundings demand it. Couple our dedicated hazardous duty design with high short-circuit strength, 80° C rise availability and Olsun Electrics’ industry proven reliability and you’re literally playing it safe in choosing Olsun for long life in your application.

* UL Listing applicable to single-phase sizes up to 50 kVA and three-phase sizes up to 150 kVA, through 600 volts.


While the majority of our business still centers around custom applications, we have found that there are commonly used encapsulated transformers and to meet that need we have developed a “Standard Encapsulated Product Offering” featuring our 28 most requested HazPac transformers.

Olsun Electrics’ Haz-Pac Transformers meet these NEC Guidelines:

National Electric Code – Classes

Environments with:

  • Flammable gases and vapors (Class I)
  • Combustible dusts (Class II)
  • “Flyings”, i.e., cotton linters, sawdust, etc. (Class III)

National Electric Code – Divisions

Explosive atmosphere that is:

  • Continually present (Division 1)
  • Present only in the event of abnormal operation of equipment (Division 2)

National Electric Code – Groups

Atmospheres including, but not limited to:

  • Ethyl ether, ethylene, or gases or vapors of like hazard (Group C)
  • Ammonia, benzene, butane, ethane, gasoline, methane, propylene and toluene (Group D)

Related Literature

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