Use an optical link between input and output - input element is an LED, output element is a photoconductive cell/ photocell. The coupled pair acts as an electrically variable potentiometer
Transistor, Darlington or Triac output, AC or DC input
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16kV optoisolator achieves 2MBd data rates Date: 24 Feb 2010 Optek's new OPI1268 16kV High Voltage Optoisolator provides power electronics design engineers with a high voltage optical isolator which delivers AC and DC voltage isolation up to 16kV while achieving digital data transmission rates of 2MBd.