Abstract: Disclosed is an overvoltage protection circuit for use in a television receiver with a floating ground, high voltage, alternating or direct current power supply in which a protective network of two spark gaps in series across one of which is coupled a capristor (or a capacitor and resistor) is connected across an isolation network between high and low voltage grounds thus limiting the maximum potential difference and providing a reliable, safe means of discharging continuous or transient high voltages which may develop between the floating ground and fixed (earth) ground. Reliability is provided by the inherent characteristics of two spark gaps in series while safety is insured by the predictable breakdown of first one spark gap rapidly followed by the discharge of the second spark gap across which is connected the capristor.