RFQ 800.336.5786

Marine Duty Isolation Transformers

Power RatingThrough 5000kVA/Single or Three Phase
VoltagesThrough 35kV
Typical 600 volt, 5kV or 15kV class/ Appropriate BIL levels per standards
FrequenciesThrough 400 Hertz
60 standard, 25, 50, 400, others as needed
WindingsCopper Standard
Aluminum also available
Temperature Rise80°C, 115°C, 140°C or 150°C
Others as required
Electrostatic ShieldSingle or Double
EnclosuresMild steel & Stainless steel available
Standard ANSI 61 Gray Powder Paint
Marine Duty braced
K Ratings4, 9, 13 or 20

Marine Duty Isolation Transformers are Custom Engineered and Designed for Any Severe Duty, Marine Environment.

Olsun Electrics Marine Duty Isolation Transformers are custom engineered and manufactured for severe duty, marine environments including:

  • Shipboard applications (Tankers, Freighters, Passenger)
  • Offshore Rigs
  • Dock, pier and near shore applications
  • Yacht/small boat electrical system isolation applications
  • Any severe duty, corrosive marine environment

Our products are designed to meet your specific application needs while maintaining compliance with IEEE 45, USCG 259, ABYC E8, ABS requirements. With over 60 years experience in the industry, Olsun customers have come to know and rely on our high quality products, workmanship and most importantly, our ability to meet unique and challenging design requirements in marine duty applications.

Primary Voltage Taps

  • Typical +2,-2 at 2.5%
  • Special tap multi-voltage switch configurations for low voltage
  • Yachting applications
  • Various tap or multi-voltage configurations available

Ambient Temperatures

  • Designs available for varying ambient and maximum ambient application temperatures
  • Maximum 40°C or 50°C, etc.


  • Design flexibility for meeting required impedances

Enclosure and Base Style and Finishes

  • Ventilated, Encapsulated or Non-Ventilated
  • Indoor/Outdoor applications and ratings: NEMA 1, 2, 3R, 4, 4X, 12, IP-23, others as needed
  • Mild steel or Stainless steel
  • Optional hurricane baffles
  • ANSI 61 gray baked on powder-coat finish. Other colors available, including “Coast Guard” white
  • Structural steel bases with stainless steel bases available
  • Hazardous location enclosures available
  • Thermostatically controlled space heaters available


  • Multiple termination combination including bus to ends and stub-up
  • Air terminal chambers available to fit your unique application
  • Flange and throat matching capabilities available


  • 100% testing per applicable ANSI C57.12.01 and C57.12.91 requirements
  • Contact Olsun for certification requirements of custom designs

Download Marine Duty Isolation Transformer Brochure