Reactors are utilized in power systems in series and shunt configurations. In series configuration they are connected in series with the circuit, and are used to control current and increase impedance serving mainly to limit current. In shunt configuration they are arranged between line voltage and ground, they help to control voltage and increase active power transport through transmission lines.

Oil filled reactors are typically used in shunt configuration to provide reactive compensation for long transmission lines and are usually located at the end of the lines. The oil filling, commissioning and maintenance procedures are comparable to oil filled power transformers. PowerSafe provides the same services for oil filled reactors as listed for oil filled transformers.

Dry type current limiting reactors are normally employed in series configuration to limit fault currents on feeders or busses. Special consideration must be given to their installation due to effects of strong magnetic fields, magnetic clearances need to be measured and compared to recommended standards as part of installation.