Majestic Transformer Co. specialises in the design and manufacture high quality bespoke and custom built electrical transformers

Custom Built Transformers

  • Single phase transformers up to 50kVAtick
  • Three phase transformers up to 125kVAtick
  • Auto transformers up to 500kVAtick
  • Transformer rectifier units up to 100kVAtick
  • High frequency transformerstick
  • Audio output transformerstick
  • Inductors and smoothing chokestick
  • Custom built transformer rectifier power suppliestick
  • Medical isolation transformerstick

Three Phase Cased Transformers

Metal Cased Three Phase Transformers



Our transformers in this range are suitably protected by a sheet metal case. They are normally wall mountable up to 2500VA and floor standing above this rating although portable styles can also be supplied. Many requirements are for isolation and/or conversion of three phase machines, or creation of a neutral where none is available. Our standard metal cases are IP23, but we can supply up to IP66 if required. Usually with little or no addition to the supply lead-time.


All our isolation transformers incorporate an electrostatic screen between the primary and secondary windings and are built in compliance with the latest European standards. Other worldwide standards, e.g. UL, CSA can also be met.

In addition, isolation from the main supply may not be required, and in this instance an auto wound transformer may be considered to economise on size and cost. Contact our sales office for details.

TOTAL SEC VA RATING SIZE (in mm)
W x D x H
Dispatch Within
75VA 220 x 152 x 223 7/10 days
120VA 220 x 152 x 223
300VA 337 x 220 x 270
500VA 337 x 220 x 270
750VA 337 x 220 x 270
1500VA 350 x 242 x 353
2500VA 350 x 242 x 353
3.3kVA 525 x 450 x 575 10/14 days
7.2kVA 525 x 450 x 575
12kVA 525 x 450 x 575
15kVA 625 x 500 x 675 2/3 weeks
30kVA 770 x 600 x 835
50kVA 770 x 600 x 835
125kVA 1050 x 800 x 875 4/6 weeks


These transformers are also available without enclosures for panel mounting
- see Open Frame Control Transformers Three Phase.


Please contact our SALES OFFICE for full details.