This paper presents a new design and implementation of the isolation stage between the power and control circuits of a three-phase rectifier controlled by the pulse width modulation technique. The isolation circuit is configured to use an optocoupler for each pulse signal produced by the control circuit, which requires a total of four references (neutral wire) to activate the thyristors of the three-phase bridge rectifier. In addition, the designs of the control and power stages are presented as well as the voltage and current oscillograms obtained at the output of the implemented three-phase converter. The experimental results obtained confirm the correct operation of the proposed configuration. Thus, broadening the discussion about distortions, glitches and enhancement of traditional energy systems. This article illustrates how to build converters in a more cost-effective way, according to the power of the specific load to be energized. The presented computer simulations show the influence of the control circuit's reference regarding total harmonic distortion. These allow evidence that the non-connection of the neutral wire decreases the waveform distortion in the tension wave.