Reactor is an electrical device that wounded with wire, which used to reduce the short circuit current.

Current-limiting reactor is an electrical inductance made up of a number of turns of wire of low ohmic resistance and inserted in series with a line to limit the current that can flow under short circuit.

Current-limiting reactors are sometimes used to limit discharge currents of capacitor banks. In such cases, a bifilar wound resistance wire is induced and connected in parallel with the inductance.