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GMC Electrical, Inc.

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STAPERM: REF. ELECTRODES
STAPERM: CPTEST EQUIPMENT
STAPERM: CPTEST STATIONS
STAPERM: LINE MARKERS
ELECTRICAL SPLICES
PIN BRAZING
FEIN POWER TOOLS
ISOZIN Zinc Tape
RECTIFIERS
CATHTECT SWITCHMODE
ONAN OIL RECTIFIER
UNIVERSAL RECTIFIERS
CERANODE SOLAR POWER
IMPRESSED CURRENT ANODES
WATER TANK HARDWARE
RCI DIESEL FUEL PURIFIERS
Aluminum ANODES
Magnesium ANODES
Zinc ANODES
Sea Shield Marine ANDOES
CP Design Estimator App



ONAN Oil cooled
Transformer Rectifier Unit



Experience born out of the harsh environs of South Africa is brought to bare on our Transformer Rectifier Units where we are undoubtedly the leaders in Transformer manufacturing Technology in South Africa.

Cathtect Engineering (Pty) Ltd. Manufacture all forms of Transformer Rectifier types from Oil Cooled on line tap changing types through to multiple fully automatic units with remote communication abilities. All our units are rugged and durable both in their weathering attributes as well as their functionality. Cathtect Engineering (Pty) Ltd. have been manufacturing Transformer Rectifier units to stringent specification since 1992 and have successfully supplied equipment to the Middle East, Americas and as well as Europe.

Oil Cooled Transformer Rectifier units take the form of
1) On Line tap switched
2) Off Line tap Switched
3) Automatic control
4) Remotely monitored & controlled


  • On line tap change units allow for manual adjustment of the output parameters whilst the power is connected to the equipment via suitably rated selector switches.
  • Off line tap change units allow for manual adjustment of the output parameters whilst the power is removed from the equipment via link type adjustment facilities.
  • Automatic Units control on 4 modes namely
  • Constant output voltage
  • Constant output current
  • Constant reference potential Instant off iteration.