Miniture Substations

Miniature Substation Design and Manufacture

Free State Transformers is an established designer and manufacturer of industry leading, durable miniature substations. These quality products are manufactured to our strict SANS 780 manufacturing standards.  Our ISO 9001:2015 certification underlines the quality of all our products.

Miniature Substations from Free State Transformers
Miniture Substations / Mini Subs
Miniature Substations up to 2 MVA!

Free State Transformers manufactures miniature substations (minisubs) up to 2 MVA with voltages of 11 kV, 22 kV and 33 kV. Our minisubs incorporate medium voltage switchgear with either SF6, oil or vacuum insulation.

Speak to our friendly, expert sales team today to discuss your needs for Free State Transformers Power Transformers!
Miniature Substation Range

Our quality miniature substation range includes:

  • Surface mount minisubs for municipal or industrial application
  • Underground mobile minisubs for the mining industry
  • Skid based minisubs for open cast mines