What We Offer



We specialise in a large range of:



We also manufacture electrical equipment for low and high voltage applications to your requirements. Circle – C Transformer designs exceed Australian Mining standards and are used extensively by the mining industry. We source only the best raw materials internationally; our modern manufacturing facility and quality standards, coupled with outstanding engineering design, produce the highest quality transformers. Our products are designed to operate in the harshest environments. High grade electrical steel is used ensuring low iron losses and all windings are manufactured from high conductivity PEI2 insulated circular or rectangular copper conductors.


Our Transformers are manufactured using materials for Class A (105°c), Class B (130°c), Class F (155°c) or Class H (180°c) applications. All designs ensure low losses and high efficiency. Circle-C Energy Controls is an AS/NZS ISO 9001 Quality Management System; AS/NZS ISO 14001 Environmental Management System; AS/NZS ISO 45001 Occupational Health & Safety Certification.


Circle-C Electrical Industries Pty Ltd formerly Cadwallader Engineering has been producing transformers and associated electrical equipment for over 50 years. Circle-C Transformers specialise in the efficient supply of high quality products for the industry and are currently in the process of introducing a quality control system to international standards.

Endurance Engineering, a company started by Mr Tom Cadwallader in 1934 is where Circle-C Transformers (Cadwallader Engineering) originated, following the sale of Endurance to the W R Carpenter group in 1948. Endurance was instrumental in producing the first high voltage neon transformers in Australia and produced a large number of parts for radio transmitters during World War 2. The company was eventually absorbed into the Tyree Westinghouse Group of companies, which is now owned by Asea Brown Boveri (ABB).

The Cadwallader’s left Endurance in 1950 to start Cadwallader Engineering, later changed the name to Circle-C Electrical Industries Pty. Ltd, trading as Circle-C Transformers, and during this time acquired Australian Transformer Industries and Willis Transformers. These acquisitions added to the already broad based skills of the company, allowing Circle-C to be able to manufacture and market an extensive range of products. Then in 2012 Circle C Transformers was purchased by the Kirkwall Group of companies and subsequently changed its name to Circle C Energy controls PTY LTD. Since this time the company has significantly expanded its product range, capabilities and the markets we trade in, we now offer word class engineering and Transformer design manufactured right here in Australia.


We look forward to giving you the customer, continued reliable service now and into the future.


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