Electrical reactors are inductive components used to influence current, voltage, or harmonic behavior in power systems and electrical equipment. Common types include AC line reactors, load reactors, DC-link chokes, harmonic-filter reactors, and shunt reactors; each serves a different circuit position and purpose. To select one, identify the application, system voltage and frequency, rated current, required inductance or impedance, installation conditions, and relevant equipment constraints. This guide explains the main options and the information B2B buyers should prepare before requesting a quotation.
This guide is intended for electrical engineers, panel builders, OEMs, contractors, and procurement teams sourcing reactors for industrial or commercial projects. It is useful when specifying a reactor for a frequency converter, motor circuit, power-quality system, or utility application. Final selection should be checked against the project design and the equipment manufacturer’s requirements.
An electrical reactor is an inductor designed for use in a power circuit. Its winding and magnetic core create inductive reactance, which affects the flow and rate of change of alternating current. Depending on its design and location, a reactor may help limit current, reduce electrical stress, or form part of a harmonic-filtering or reactive-power arrangement.
A reactor does not replace a circuit breaker, fuse, surge protective device, or correctly engineered filter. It also does not automatically remove all harmonics or correct every power-quality problem. Its effect depends on the circuit, the reactor’s electrical characteristics, and the connected equipment.
| Reactor type | Typical circuit position | Common purpose |
|---|---|---|
| AC line reactor | Between the supply and a drive or other load | Helps limit current changes and can reduce some supply-side disturbances reaching connected equipment. |
| Load reactor | Between a frequency converter and a motor | Can help manage the effects of the drive output on the motor and cable, subject to the drive and motor manufacturer’s guidance. |
| DC-link choke | In a converter’s DC bus | Used to influence DC-link current ripple and converter input-current behavior. |
| Harmonic-filter reactor | As part of a tuned or detuned filter arrangement | Works with capacitors and other components to address specified harmonic conditions. |
| Shunt reactor | Connected in parallel with a power network | Used in power systems to absorb reactive power, with sizing based on network conditions. |
These categories are not interchangeable. For example, a line reactor and a load reactor may both be associated with a frequency converter, but they are installed on different sides of the drive and address different circuit conditions. Always confirm the intended position and function in the project schematic.
For a low-voltage frequency converter, buyers commonly consider an AC line reactor, a load reactor, or a DC-link choke. A line-side option may be evaluated where the supply or drive manufacturer identifies a need for additional impedance. A load-side reactor may be considered for a drive-to-motor connection, particularly when cable length or motor insulation requirements call for review; the drive manufacturer’s limits should guide the decision.
Harmonic-filter reactors are selected as components within an engineered filter, rather than as standalone remedies. The design should account for the measured or calculated harmonic spectrum, capacitor ratings, resonance risks, and network impedance. Shunt reactors address a different need: they are used in power systems where reactive-power conditions justify their application and require system-level engineering.
Operating frequency is a basic selection input: industrial AC systems commonly operate at 50 Hz or 60 Hz, while converter output conditions can differ from the supply frequency. A reactor’s suitability therefore depends on its circuit location and duty, not simply its nominal frequency label. Share the full application and electrical conditions with the supplier before confirming a design.
Start by stating whether the reactor will be installed on the AC input, DC link, motor output, filter branch, or utility network. Describe the issue the design is intended to address, such as current limitation, converter compatibility, or a specified harmonic target. This prevents the common mistake of requesting a generic “reactor” without enough context to identify the correct product category.
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Prepare the system voltage, phase arrangement, rated current, frequency, and required inductance or impedance if already established by the design. Where percentage impedance is specified, state the reference basis and the connected equipment details. In low-voltage drive applications, 3% and 5% impedance are commonly encountered options, but neither value is universally correct; the drive documentation and system design should determine what is appropriate.
Confirm the enclosure or mounting arrangement, cooling method, ambient conditions, altitude if relevant, and available space. Ask for the applicable insulation and temperature-rise information for the proposed design. For example, Class F insulation is associated with a 155°C thermal-class designation; this is an insulation-system classification, not a statement that the reactor should operate at a 155°C ambient temperature.
Check terminal arrangement, conductor size, enclosure requirements, and connection method against the panel or equipment layout. For converter applications, confirm compatibility with the specific drive and motor, including any manufacturer restrictions on output reactors or cable length. Coordinate reactor selection with protective devices and system fault levels rather than treating the reactor as a protective device.
Reactor pricing depends on factors such as electrical rating, core and winding design, enclosure, terminals, thermal requirements, and order quantity. A standard configuration may be easier to quote than a design requiring project-specific dimensions or electrical parameters, but availability varies by supplier and specification. Buyers should request a written quotation that identifies the proposed rating, configuration, included documentation, and any options.
Minimum order quantity and lead time are supplier- and product-specific, so they should be confirmed rather than assumed. For project planning, provide the required quantity, delivery destination, target date, and whether samples or staged shipments are needed. If a project has an approval process, ask early which drawings and technical documents can be provided for review.
ANNEZEE supports B2B buyers sourcing electrical equipment and supplies, including electrical reactor solutions for project and equipment applications. To help us assess a request, share the reactor’s intended use, system voltage and frequency, rated current, required electrical parameters, installation details, quantity, and target delivery schedule. We can then review the specification and discuss a suitable configuration; final acceptance should be based on the project’s technical requirements and documentation.
The right electrical reactor depends first on where it will be installed and what the circuit needs it to do. AC line reactors, load reactors, DC-link chokes, filter reactors, and shunt reactors serve different functions, so a product should not be chosen by name or percentage impedance alone. Verify ratings, operating conditions, equipment compatibility, and supplier documentation before placing an order.
For an efficient sourcing process, prepare a schematic or clear circuit description, the equipment nameplate data, the required quantity, and any project-specific standards or dimensional constraints. Send these details to ANNEZEE for a technical discussion and quotation. This gives both parties a clearer basis for evaluating reactor type, configuration, commercial terms, and delivery requirements.
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