Our three-phase transformers supply electrical consumers by magnetically transforming a grid voltage to the desired output voltage. In addition to the conventional standard products for electrical engineering and power supply, Bächli develops and delivers the entire range of transformer versions from 10 VA to 1000 kVA. In addition to low-price products, the portfolio predominantly focuses on customer-specific and energy-efficient products. The highest efficiency Smart-E-Power® model comes in modern compact sizes and meets the highest expectations.
All products are CE conform. Transformers from 1 kVA and above comply with the EU Ecodesign Directive 2009/125/EG.


  • Available as isolating, safety or auto transformers
  • As well as starting transformers and star point generators for power networks with no neutral conductor
  • All transformers supplied in accordance with EN 61558, UL 5085 and CSA22.2 standards as well as category XPTQ2/8 and Lloyds
  • Higher Currents up to 10,000 A and voltages up to 1000 V depending on standards Horizontal design as standard, vector group Yy0 or Dyn5 for 100 % resilient neutral conductor
  • Isolating, safety and auto transformers in a variety of models (see data sheets)
  • All transformers up to 3,000 VA in insulating material class B (130 °C), otherwise in F (140 °C)
  • All 50 Hz transformers can also be used for 60 Hz
  • Can be as a power supply unit with a controlled or uncontrolled rectifier