01
LV, MV & HV Maintenance
24/7 on-site maintenance for plant and power equipment, helping critical operations recover quickly and run reliably.
South Africa & neighboring regions
Powering Africa with reliable transformers & switchgears
Industrial power systems delivered with engineering precision—from new connections and installations to full overhauls and emergency support.
Our clients
Trusted across industry & municipalities
What we do
Power expertise, from connection to rebuild
A complete service partner for utilities, industrial plants, mines and infrastructure operators.
02
Installation & Project Management
End-to-end delivery of high-voltage distribution networks, from technical planning through installation and commissioning.
03
New LV, MV & HV Connections
Safe, compliant industrial electrical connections engineered around your site, load profile and future capacity.
04
Overhaul & Refurbishment
Workshop and field refurbishment from smaller plant items to complete large power transformer rebuilds.
Equipment
Built for demanding power environments
Supply, installation and lifecycle support for essential distribution equipment.
Power Transformers
Distribution and power transformers engineered for dependable service under demanding loads.
Mini-Substations
Compact distribution packages configured for industrial and utility sites.
Switchgear
MV switchgear focused on safety, control and operational continuity.
Technical range
Equipment specifications
Explore indicative ratings and request a quote for the exact item your project needs.
Final equipment ratings, compliance and suitability must be confirmed against your project requirements.
SANS 780 range
Standard transformers
ConfigurationRated output · select to quote
Pole-mounted
Ground-mounted distribution
Heavy commercial & industrial
Mini-subs
Miniature substations
ApplicationRated output · select to quote
Light commercial
Medium commercial & utility
Heavy industrial & mining
11 kV applications
Medium-voltage switchgear panels
Panel typeRated current / capacity · select to quote
Ring main units · distribution / feeder
Primary substation switchgear
Always on call
When power stops, your operation cannot wait.
Our teams provide 24/7 emergency and planned maintenance support across South Africa and neighboring regions.
- On-site fault response
- Preventative maintenance
- Plant and power equipment support
What they say
In their words
Feedback shared by clients of TNA Transformers & Switchgears.
“We needed a reliable partner for our high-voltage distribution project. TNA delivered on time and their technicians handled everything with great professionalism. Our site has been running smoothly ever since.”
“Our municipality faced urgent transformer maintenance issues. TNA’s 24/7 support team responded quickly and restored power within hours. Their service is excellent and dependable.”
“TNA helped us with refurbished transformers for our solar plant. The equipment was tested, certified, and came with a solid warranty. It saved us money without compromising on quality.”
“We’ve worked with TNA for over five years on our mining sites. Their transformers and switchgears are durable, and the backup service is outstanding. A trusted partner for heavy industry.”
Request for quotation
Tell us what your operation needs.
Share your equipment and site requirements. Your request will open in WhatsApp for review by the TNA team.
Main line087 265 2500Sales emailInfo@tnainvest.co.za24/7 support062 025 1599
CoverageSouth Africa & neighboring regions
Office / warehouseUnit 8 Weststar Park, Reduktor Avenue, Stormill, Roodepoort