A system for heat ablation of tissue in a patient, the system comprising: a plurality of electrodes (201, 202, 203) operatively connected to a source of radiofrequency energy, the plurality of electrodes configured to apply RF energy to the tissue of the patient; at least one return electrode adapted to contact the patient and configured to return RF energy to the RF source; a switching mechanism including a plurality of electro-optical devices configured to be activated by signals from corresponding channels (CH_1, CH_2, CH_3) coupled to the plurality of electrodes (201, 202, 203), respectively; a plurality of RF current restricting circuits coupled to the plurality of electro-optical devices each circuit coupled between one of the plurality of electrodes and the source of RF energy, and configured to restrict a flow of RF energy to the at least one electrode when the current restricting circuit is enabled and to not restrict the flow of RF energy to the at least one electrode when the current restricting circuit is disabled, wherein at least one of the current restricting circuits comprises: a switch configured to direct the flow of electrosurgical energy; and a plurality of current restrictive devices arranged to restrict the flow of RF energy when the switch is disposed in a first position and not restrict the flow of RF energy when the switch is disposed in a second position; wherein the plurality of current restrictive devices includes diodes (D1, D2, D3, D4); and wherein a plurality of the diodes is arranged in an H-Bridge arrangement, the switch being disposed therein, and wherein electrosurgical energy is conducted when the switch is closed. a plurality of electrodes (201, 202, 203) operatively connected to a source of radiofrequency energy, the plurality of electrodes configured to apply RF energy to the tissue of the patient; at least one return electrode adapted to contact the patient and configured to return RF energy to the RF source; a switching mechanism including a plurality of electro-optical devices configured to be activated by signals from corresponding channels (CH_1, CH_2, CH_3) coupled to the plurality of electrodes (201, 202, 203), respectively; a plurality of RF current restricting circuits coupled to the plurality of electro-optical devices each circuit coupled between one of the plurality of electrodes and the source of RF energy, and configured to restrict a flow of RF energy to the at least one electrode when the current restricting circuit is enabled and to not restrict the flow of RF energy to the at least one electrode when the current restricting circuit is disabled, wherein at least one of the current restricting circuits comprises: a switch configured to direct the flow of electrosurgical energy; and a plurality of current restrictive devices arranged to restrict the flow of RF energy when the switch is disposed in a first position and not restrict the flow of RF energy when the switch is disposed in a second position; a switch configured to direct the flow of electrosurgical energy; and a plurality of current restrictive devices arranged to restrict the flow of RF energy when the switch is disposed in a first position and not restrict the flow of RF energy when the switch is disposed in a second position;