Ul-approved transformers

Benefits of our UL-approved transformers

  • The certification of Underwriters Laboratories (known as UL) allows the use and export of our products to the USA
  • Tested housing materials and insulation materials
  • Regular production monitoring at the equipment manufacturer


Examples of UL-approved one- and three-phase transformers

Type series   FTUL 24 to FTUL 1451

Single-phase transformer with UL approval

Type series FTUL 24 to 1451 according to VDE 0570 / EN 61558 Part 2 – 2 / 4 and UL 506
As spar winding according to VDE 0570 / EN 60558 Part 2 – 13 with index -A

  • Jacket transformer / EJ sheet cut
  • Power range 40 – 3000 VA
  • Frequency 50 / 60 Hz
  • Insulation class T 40 / B
  • Protection class IP 00
  • Installation suitability up to IP 20
  • Protection class I
  • Separate windings
  • Savings winding recognizable by ending -A (e.g. FTUL 24-A)
  • Vacuum soaked
  • Transformer terminals
  • Foot angle fastening
  • Contact protection according to VBG 4
  • Switch-on time 100

Type series DTU / DTUL 0.15 up to DTU / DTUL 30.0

Three-phase transformer
Type series DTU / DTUL 0.15 to DTU /DTUL 30.0 according to VDE 0570 / EN 61558 Part 2 – 1 and UL 506

In spar winding according to VDE 0570 / EN 61558 Part 2 – 13 with index -A

  • Three-legged core transformer / 3 UJ sheet cut
  • Power range 200 – 30000 VA
  • Frequency 50 / 60 Hz
  • Insulation class T40 / B
  • Protection class IP 00
  • Suitable for installation up to IP 20, protection class I
  • Vacuum soaked
  • Foot angle fastening
  • Connection to terminals
  • From DTU / DTUL 1.0 with duct installation position
    vertical, in case of different installation
    approx. 10 performance reductions
  • Contact protection according to VBG 4


Standard circuits

  • Separate winding transformer star-star circuit with secondary zero point (Yyn0)
  • Ballast-Spartransformer Star-Saving Circuit
    with zero point (Yna0). Recognizable
    end -A (e.g. DTU0, 12-A)

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