Electrical reactors are inductive components used in power and drive systems to limit current, reduce electrical stress, or support harmonic-control designs. The right type depends on where it will be installed and what problem it must address: line reactors are fitted on the supply side of a drive, output reactors on its motor side, and detuned or filter reactors in power-factor-correction and harmonic-control systems. At ANNEZEE, we recommend beginning selection with the system voltage, frequency, current, load, and installation point. These details help buyers compare suitable configurations without treating one reactor type as a universal solution.
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This guide is intended for electrical equipment distributors, panel builders, system integrators, OEMs, and industrial project buyers evaluating electrical reactors. It is useful during preliminary design, supplier comparison, and preparation of a request for quotation. It does not replace a system study or the equipment manufacturer’s instructions. Final selection should be checked against the actual installation and applicable project requirements.
An electrical reactor is an inductor designed to provide a specified inductance or impedance in an AC or DC circuit. Its coil and magnetic core store energy in a magnetic field and oppose changes in current. In practical installations, the reactor’s effect depends on its electrical rating, the circuit frequency, and how it is connected.
Reactors may be used to limit inrush or fault current, reduce the rate of current change, help protect drive components, or work with capacitors in a harmonic-control arrangement. They can also help reduce the impact of certain voltage disturbances on connected equipment. A reactor does not, by itself, guarantee a particular harmonic level, eliminate all electrical noise, or replace protection devices and a properly engineered filter.
A line reactor is installed between the incoming power supply and a variable-frequency drive or other power-conversion equipment. It adds impedance to the input circuit and may help limit current disturbances and protect the drive from some supply-side events. Buyers commonly evaluate it where the supply is electrically stiff, the drive manufacturer recommends input impedance, or multiple drives share a supply. Confirm compatibility with the drive and the required current rating before specifying one.
An output reactor is installed between a drive and its motor. It can help moderate voltage and current waveforms at the drive output and may be considered where motor leads or operating conditions raise concerns about reflected-wave stress. Suitability depends on the drive, cable, motor, switching characteristics, and manufacturer guidance. It is not a substitute for checking cable-length limits or motor insulation requirements.
A DC-link choke is placed in a converter’s DC circuit, where it can smooth current and influence current ripple. Some drive designs include a choke internally, while others may allow an external component. Before specifying one, establish whether the equipment already includes the required DC-link impedance and whether an additional choke is permitted by the manufacturer.
A detuned reactor is used in series with capacitors in a power-factor-correction bank. The reactor shifts the bank’s resonant frequency so that the capacitor-reactor combination is less likely to amplify certain harmonic currents under the intended system conditions. The design must be coordinated with the capacitor rating, network frequency, and harmonic environment. A detuned bank is not identical to a tuned harmonic filter.
Filter reactors are designed as part of a specific harmonic-filter circuit and must be matched with the other filter components. Current-limiting reactors are selected to restrict current in applications such as feeder, busbar, or equipment protection schemes. These functions have different design constraints, so buyers should provide the circuit diagram or a clear description of the intended use when requesting a quotation.
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Start by identifying the installation point and the problem the reactor is expected to address. For example, an input-side concern on a drive points toward evaluating a line reactor, while a motor-side cable or waveform concern may call for an output reactor assessment. A capacitor bank exposed to harmonics requires a coordinated detuning or filtering design rather than an automatically selected drive reactor.
Then confirm the electrical system details. A project specification might, for example, describe a three-phase supply rated at 400 V and 50 Hz; these values are illustrative, not a universal reactor rating. The supplier will also need the operating or rated current in amperes, the load or drive information, and, where relevant, the desired inductance or impedance.
Impedance is sometimes stated as a percentage, but the appropriate value depends on the equipment and application. For preliminary comparison, buyers may encounter specifications such as 3% or 5% impedance; these are examples, not recommendations for every system. Ask the supplier to confirm the calculation basis and compatibility with the connected equipment before treating a percentage value as a final design decision.
Reactor pricing depends on factors such as electrical rating, core and winding design, insulation system, enclosure, cooling arrangement, and customization. A standard catalog configuration and a project-specific design may have different costs and production requirements. Buyers should request a quotation based on a complete specification rather than comparing prices that may describe different products.
Minimum order quantity and lead time are supplier- and configuration-dependent. Availability may be affected by material requirements, engineering review, production scheduling, and inspection or documentation needs. For a reliable estimate, provide the target quantity, delivery destination, required delivery date, and any packaging or document requirements when requesting a quote.
Ask whether the supplier can confirm the proposed reactor’s electrical ratings, connection arrangement, and intended application in writing. Review the datasheet, outline drawing, terminal details, and any available routine inspection or test documentation relevant to the order. Also clarify the warranty terms, packing method, quotation validity, and process for approving custom drawings.
Check that communication covers the complete installation rather than only the component price. A supplier should be able to identify missing information and explain which values require confirmation by the project engineer or equipment manufacturer. Avoid assuming that a product is suitable simply because its current rating appears close to the load current.
The best electrical reactor is the one matched to the circuit location, application, and verified system ratings. Identify the function first, then provide voltage, frequency, current, connected equipment details, installation conditions, and any project-specific documentation requirements. This approach helps narrow the options and reduces avoidable specification gaps.
At ANNEZEE, we support B2B buyers with reactor selection discussions and quotation review based on the information provided for each project. Send your application details, target quantity, and delivery requirements to request a suitable proposal. Where system behavior or harmonic performance is uncertain, have the design reviewed by a qualified electrical engineer before placing the order.
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