MasTec Ltd have Jumo and AEG of Germany, both leading world supplier of single phase and three phase Proportional Thyristor controllers and Power systems.
| Lower Power Thyristor Controllers 230VAC or 415 VAC current to 150 amps |
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| Single Phase units | Jumo |
| Three Phase units | Jumo |
| High Power Thyristor Controllers 230VAC or 415 VAC current to 2000 amps |
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| Single Phase units | AEG |
| Three Phase units | AEG |
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