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Drive Isolation Transformers: 7.5-440 KVA, 3PH

Special Voltages and KVA Sizes for Drive Applications

For SCR (Silicon Control Rectifier) variable speed motor drive applications, a transformer is needed to magnetically isolate the incoming line from the motor drive. The transformer must also provide a voltage change to match the required voltage of the SCR Drive. Standard designs are delta primary and wye secondary to match the common power sources required in most three phase rectifier circuits.

Hevi-Duty drive isolation transformers are specifically designed to handle the mechanical stresses, voltage demands and harmonics associated with SCR applications.


  • Available from 7.5 thru 440 KVA, 3 Phase, 60 Hz
  • Isolation minimizes load disturbances caused by the SCR drive
  • UL-3R enclosures when used with optional weather shield
  • Taps on all units for adjustments to incoming source voltage. Full capacity secondary neutral as required by the National Electric Code.
  • Shielding attenuates line to ground noise
  • 10+2 year Sola/Hevi-Duty warranty 

PDF Files

Selection Table and Electrical Connections
Operations & Maintenance Recommendations


Drive Isolation Transformers

kVA Drive Horse Power Group I Catalog Number Group II Catalog Number Group III Catalog Number
460 D Pri
460Y/266 Sec
60 Hz
460 D Pri
230Y/133 Sec
60 Hz
575 D Pri
230Y/ 133 Sec
60 Hz
7.5² 5 DT651F7.5S DT661F7.5S DT631F7.5S
11³ 7.5 DT651H11S DT661H11S DT631H11S
14³ 10 DT651H14S DT661H14S DT631H14S
20 15 DT651H20S DT661H20S DT631H20S
27 20 DT651H27S DT661H27S DT631H27S
34 25 DT651H34S DT661H34S DT631H34S
40 30 DT651H40S DT661H40S DT631H40S
51 40 DT651H51S DT661H51S DT631H51S
63 50 DT651H63S DT661H63S DT631H63S
75 60 DT651H75S DT661H75S DT631H75S
93 75 DT651H93S DT661H93S DT631H93S
118 100 DT651H118S DT661H118S DT631H118S
145 125 DT651H145S DT661H145S DT631H145S
175 150 DT651H175S DT661H175S DT631H175S
220 200 DT651H220S DT661H220S DT631H220S
275 250 DT651H275S DT661H275S DT631H275S
330 300 DT651H330S DT661H330S DT631H330S
440 400 DT651H440S DT661H440S DT631H440S

1. Weather shields come in a set of two and must be ordered separately
2. Encapsulated. No weather shield required. cULus E77014.
3. Units are CSA marked.

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