Electrosurgical generator and system

An electrosurgical generator for supplying power to an electrosurgical instrument, the generator comprising:

• a radio frequency output stage having at least a pair of electrosurgical output connections for the delivery of radio frequency power to the instrument and a radio frequency switching device for delivering the radio frequency power to the output connections, and
• control circuitry operable to limit the radio frequency peak output voltage developed across the output connections to at least a first predetermined threshold value for coagulation and second predetermined threshold value for cutting or vaporization and, in a blend mode of the generator, to alternate constantly between said first and second threshold values, and to activate the radio frequency switching device when the radio frequency peak output voltage has reached the first predetermined threshold value during coagulation or the second predetermined threshold value during cutting or vaporization, and thereby, to reduce the delivered output power, said first and second threshold values, and, thus, the peak output voltages for coagulation and cutting or vaporization, being different from one another.