Current limiting device

摘要

A current limiting device comprises a first superconducting element (4) for connection in an electrical circuit. The superconducting element (4) has a critical current density. A second superconducting element (12) detects the onset of a fault condition. A coil (13) is responsive to the second superconducting element (12) to vary the relationship between the critical current density and the current carried by the first superconducting element (4) so that the element transforms into a resistive state.