011 794 9498 sales@redmetal.co.za

Cast Resin Mini Substations

Safest Surface and Underground Solution

Range from 100 kVA up to 2500kVA
Operating voltages up to 33kV
✓Customised solutions for

Compact Subterranean Architecture

Custom-engineered compact enclosures with IP54 as standard, with specialized mining-grade protection options  dimensioned for shaft cages, narrow tunnels and confined installation profiles underground.

Integrated Multi-Compartment Safety

Mechanically interlocked Medium Voltage (MV), Transformer and Low Voltage (LV) compartments guarantee maximum operator safety during on-site switching — with custom interlocking and security systems available for unauthorized-access prevention.

High Overload Capacity & Thermal Stability

Air-cooling profiles optimized through in-house Computational Fluid Dynamics (CFD) simulation allow our underground mini substations to absorb cyclic peak loading without premature insulation degradation.

How We Deliver Compact Power Underground

Underground Mining Substations

Our flagship product: the oil-free underground mini substation, purpose-built for confined workings where fire safety and footprint are non-negotiable proven in deep-level gold and platinum mines and Zambian copper operations

Relocatable & Skid-Mounted Substations

Substations that move with the mining face: skid-mounted and mobile designs engineered for rapid relocation as workings advance, minimizing re-installation downtime.

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Installation & Commissioning

Complete delivery, rigging, installation and commissioning by teams experienced in underground logistics across sub-Saharan Africa.

Custom Mini Substation Design & Manufacture

As a specialist mini substation manufacturer in South Africa, we design and build compact cast resin substations around your exact network single-line diagram from transformer rating to LV breaker selection.

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MV/LV Switchgear Integration

Ring main units, MV protection, LV distribution breakers and metering integrated and factory-tested as one assembly, using preferred components from ABB, Schneider Electric, Electronicon, Lovato and others.

Why Partner With Us?

We pride ourselves on delivering turnkey solutions with continued support. When you partner with us, you have guaranteed access to the following:

  • Competitive pricing
  • On-site analysis of your network
  • Data-based reporting with our expert recommendations
  • Design and engineering with world-leading EPLAN software
  • Preferred electrical components like ABB, Schneider
  • we are able to fully customise your unit with your preferred switchgear-if available at the time of procurement
  • Installation and commissioning service

Request a quote:

011 794-9498
sales@redmetal.co.za

Request a quote

Operating in Confined or Advancing Underground Workings?

Conventional surface-style substations are too large, too flammable and too slow to deploy for modern underground mining. Our compact substation range is engineered specifically for these constraints

 

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Shaft-Cage Dimensional Design

Substations dimensioned to your shaft conveyance and tunnel profile, so units reach the working level without splitting or re-assembly underground.

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Fire-Safe Oil-Free Operation

Cast resin transformers eliminate oil fires, sumps and environmental containment — simplifying approvals with mine safety and environmental departments.

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Custom Interlocking & Security

Mechanical and electrical interlocking between MV, transformer and LV compartments, plus tamper-proof security systems for unmanned underground installations.

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Rapid Manufacture & Delivery

 Local manufacture means 6–8 week lead times on custom units — compared to months for imported alternatives — keeping shaft-sinking and development schedules on track