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General Purpose 1 Phase

ABB's 9T33 line of Low Voltage Dry Type Single-phase transformers are for applications requiring a 3-wire secondary voltage for 120/240 V systems.  These QL transformers come in standard NEMA 2 enclosures with rain shield kits available as accessories for NEMA 3R installations. The transformer is used to obtain the load voltage from the distribution voltage while providing galvanic isolation. Since no vaults are required for installation, these transformers can be located right at the load to provide the correct voltage for the application. This eliminates the need for long, low voltage feeders.

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GE by ABB Low voltage dry type single-phase transformers


What you want. When you want it.

Speed up your projects
Outward facing feet for faster installation
Rapid access for service
Easy off front and back panel rapid access for service
More value for your money
Ground and lug kit included; more value for your money
Same day availability
Same day availability through ABB stocking distributor



  • Built to last
  • Designed to reduce operating costs
  • Easy access for installation and maintenance



9T33 line

  • Unique core and coil design using non-grain-oriented silicon steel
  • Ground bar kit and lug kit included
  • Single piece front/back
  • Outward facing feet
  • Copper ground strap


Technical Specifications

9T33 line

  • 15 – 100 kVA
  • Connection: 3-wire or 2-wire secondaries
  • Voltages: (P) 240x480 (S) 120/240
  • Temperature Rise: 150 °C; 220 °C Insulation Class; IEC 60085 Class R
  • Ambient temperature: 40 °C
  • Frequency: 60 Hz
  • Standard single phase tap arrangement
  • Painted, ANSI #61 gray NEMA 2 enclosure
  • NEMA 2 drip proof enclosures
  • Rain shield available for field conversion to NEMA 3R



9T33 line

  • ANSI/NFPA 70: National Electrical Code
  • ANSI/IEEE C57.96: Distribution Transformers, Guide for Loading Dry Type appendix to ANSI C57.12 standards
  • IEEE C57.12.01: General Requirements for Dry Type Distribution Transformers
  • IEEE C57.12.91: Test Code for Dry Type Distribution Transformers
  • NEMA ST-20: Dry Type Transformers for General Applications
  • UL 1561: Dry Type General Purpose Power Transformer G. Efficiency level DOE 2016 by 10 CFR PART 431
  • CSA 802.2: NRCan Energy Efficiency
  • CBC 2019, IBC 2018, ASCE7.05-2016: Seismic qualifications
  • ZXPC:EV519886: Energy Verification for US
  • ZZED:EV23760 : Energy Verification for CN



  • General purpose lighting and electrical installations