SDG – Technologies


Specialists in Liquid Resistance Starter (LRS) performance.

Whether you need to test your LRS or buy a new LRS, we can assist.


About Us

Electrical Engineering Excellence

SDG Technologies was established in 1999 by Paul van Zyl, an electronic engineer known for his knowledge both in the electronic and electrical fields, and specializes in improving Liquid Resistance Starter (LRS) performance. We have been involved for more than 10 years in numerous investigations and remedial action where inadequate LRS performance was responsible for damage resulting in mechanical failure

Our Services

Buying an LRS

Are you looking to purchase an LRS? We can supply you with an LRS coupled with our unique Safe Start Control System that results in optimal performance. 

Testing an LRS

  • Would you like to test the performance of your current LRS?
  • Are you experiencing any issues with your LRS?
  • Are you experiencing any breakages or failures in your drivetrain?

Safe Start Control System

We implement our unique control system for your LRS to provide optimal performance and reduce the likelihood of drivetrain and motor failures.

Case Studies

Some our projects!

Three advanced LRSs (which consist of a high turn down ratio LRS and a Mill Safe Start) to be installed at the one primary and the two regrind mills.
This platinum concentrating plant installed Mill Safe Start Systems on two of their primary mills and one secondary mill.
Two Mill Safe Start Systems were installed at this nickel plant – one each on their Ball and Fag mills, which starts up with LRSs. 

Some of our clients

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