Buck-Boost Transformers - 1-Phase (NEMA Rated)

Jefferson Electric Buck-Boost Transformers, Auto-Transformers and Isolation Transformers

• 240 x 120 VAC to 24 x 12 VAC Transformers
• 240 x 120 VAC to 32 x 16 VAC Transformers

Buck-boost transformers are designed to maximize the performance and life of electrical equipment. They are typically used to power loads with specific voltage requirements that differ from the available line voltage. A single buck-boost transformer is used to boost or buck single-phase voltage. Two or three units are required to boost or buck three-phase voltage. Buck-boost transformers can be connected as auto-transformers or isolated transformers.

• When connected as an auto-transformer, these buck-boost transformers provide a means of raising (boosting) or lowering (bucking) a supply line voltage by a small amount (usually no more than 20 percent).
• When connected as an isolation transformer, these power transformers can be used to step-down supply power to low voltage circuits at the nameplate rating listed.

Features

• Encapsulated with electrical grade resin
• Cores of high-quality electrical steel
• Aluminum/copper windings (see nameplate for product specific information)
• 60 Hz operation
• NEMA 3R-rated enclosures
• 135ºC temperature rise, 180°C insulation class or 95°C temperature rise, 130°C insulation class depending on kVA size
• Heat-cured ASA-61 gray powder coat finish
• Slotted mounting holes for quick and easy mounting
• Permanently affixed wiring diagram
• 10-year limited warranty (limited to mfg. defects)
• Single-phase encapsulated isolation transformer ratings 50VA to 2kVA
• Ambient temperature 0 - 25°C (32 - 77°F)
  (Per UL506, UL5085-1, 2 General Purpose Transformers)

Applications

• Air conditioners
• Heating elements
• Motor applications (not motor control circuits per NFPA 79 9.1.1.1)
• 277 volt supply for lighting systems
• Single-phase connections - require one transformer
• Three-phase open delta connections - require two transformers
• Three-phase wye delta connections - require three transformers

Note: Buck-boost transformers do not compensate for fluctuating line voltages. They should only be used when line voltage is relatively constant.

Standards/Approvals

• Built in accordance with UL1446, CAN/CSA - C22.2 No. 0
• Agency Approval UL File #E4466