Iron Core Reactors with coils consist of small wires, straps or cables wound about an iron core. This reactor is designed considering higher harmonic losses. These are designed with lower flux densities and are in smaller in dimensions. An applications of iron-core reactors are to increase the reactance of one branch of parallel circuits so the load will divide properly among the branches, to compensate for the leading charging current of a long transmission line as when used for shunt reactors operating at nearly constant voltage and to limit the current of an arc furnace transformer. These reactors are used in various branches of electrical engineering.