Abstract: A self-saturating electrical reactor has a magnetic core located within a casing. A gate winding has at least one turn on the magnetic core and is accessible from outside of the casing. A bundled conductor containing a plurality of individual conductors has at least one turn on the magnetic core. The individual conductors form a plurality of single turn windings which are accessible from outside of the casing such that the configuration of the D.C. control and bias windings is determinable by the field wiring.