.~ Over-voltage or over-current controlled substitution
DEFINITION
Classification: 315/91
(under subclass 88) Systems provided with means for automatically substituting the nonoperating load device or electrode for the first to operate load device or electrode in response to excessive voltage or current conditions as would tend to damage the first to operate load device or electrode.
(1) Note. This subclass includes systems provided with an electric discharge gap connected in electrical parallel with the source of supply and the load device, the spark gap being adapted to ionize and to dissipate any voltage or current surge and thereby protect the load device from such surge. It also includes similar systems wherein the discharge gap is designed to replace the load device when the load device fails, the spark gap becoming ionized due to the increase in voltage in the circuit caused by the failure of the load device.
SEE OR SEARCH CLASS
361, Electricity: Electrical Systems and Devices,
1+, for systems of general application. Note indented subclasses 117+ for lightning arresters.
