Custom 380V 480V 50Hz 60Hz Enclosed Three Phase Transformer For Factory Equipment

1. Product Introduction

This three phase reactor is a series connected inductive component used in variable frequency drive systems, industrial power distribution and harmonic mitigation. It is built on a laminated silicon steel core with three separate coil legs, so each phase carries its own winding and the assembly presents balanced impedance to a three phase supply. Connected in series with the line, it limits the rate of current rise, absorbs voltage surges and attenuates the harmonic current that switching converters inject back into the mains.

A reactor is not a transformer. There is no secondary winding and no voltage conversion. The full load current flows through the winding continuously, so the core must handle real working flux without saturating. The design therefore uses a gapped laminated core with generous cross section and heavy gauge conductor, sized so that inductance stays stable at rated current and under overload rather than collapsing at the moment it is most needed.

The unit is supplied in a ventilated sheet steel enclosure with mounting feet, so it can be floor mounted or fitted inside a control cabinet. Windings are vacuum impregnated and film wrapped for insulation and mechanical rigidity, and the output is brought to marked copper busbar terminals for direct cable lug connection. Rated current, inductance per phase, voltage class, impedance percentage, enclosure size and terminal layout are all defined against the customer drawing or system requirement.

Specification Table

2. Product Features

• Three independent coil legs on one laminated core, giving balanced impedance across all three phases.
• Gapped silicon steel core sized for continuous full line current, so inductance holds up at rated load and during overload instead of saturating.
• Limits di/dt and suppresses voltage surges reaching the drive, protecting rectifier diodes and DC bus capacitors.
• Reduces total harmonic distortion drawn from the mains, helping the installation meet power quality requirements.
• On the drive output side, reduces dv/dt stress on motor cable and winding insulation and limits cable charging current on long runs.
• Class H insulation with vacuum varnish impregnation for high thermal margin and resistance to vibration and humidity.
• Ventilated steel enclosure with mounting feet, ready for floor mounting or cabinet installation without extra hardware.
• Marked copper busbar terminals sized for cable lugs, giving low contact resistance and straightforward field wiring.
• Natural air cooling with no fan, so there is no moving part to fail and no maintenance requirement.
• Full customization of current rating, inductance, impedance percentage, voltage class, terminal position and enclosure dimensions.

3. Product Applications

• Input line reactors for variable frequency drives and soft starters
• Output reactors between drive and motor on long cable installations
• Harmonic filter reactors in detuned capacitor banks for power factor correction
• Rectifier and DC link reactors in industrial converter systems
• Solar inverters, wind converters and energy storage grid tie equipment
• UPS systems and industrial DC power supply installations
• Motor control centres, pump and fan stations and HVAC plant rooms
• Machine tools, extruders, compressors and other heavy industrial machinery
• Elevator and crane drive systems
• Distribution panels requiring current limiting and power quality improvement

4. Advantages

4.1 Company Advantages

• Established in 2000, with 26 years of continuous focus on magnetic components and power solutions for industrial control and power electronics.
• Own 10,000 sqm production base with 8 complete production lines, operating as a manufacturer rather than a trading company.
• Dedicated 20-person R&D team and 20-person QC team, with engineering consultants holding over 26 years of design experience.
• Annual export value of USD 42 million, serving North America (50%), Northern Europe (18%), South America (15%) and Southeast Asia (15%).
• ISO 9001 and ISO 14001 system certification, with CE, CB, UL, cUL and RoHS product certification available.
• Proven customer base including well known appliance and signalling equipment brands and North American inverter manufacturers.
• In-house capability across the full magnetic range, from SMD inductors to cabinet size reactors, so one supplier can cover the whole bill of material.
• Trade support with DDP and DDU terms, and payment accepted by T/T, PayPal and Western Union.
• Complete ODM and OEM service from electrical calculation and sample building to mass production, with MOQ from 1,000 pcs for standard components and project based quantities for cabinet type reactors.

4.2 Product Advantages

• Core cross section and air gap are calculated for the actual working current, so inductance does not fall away under overload when protection is most needed.
• Conductor cross section is selected against a defined temperature rise limit rather than the minimum that will simply carry the current, which extends insulation life.
• Balanced three phase construction keeps phase to phase inductance deviation low, avoiding current imbalance in the drive.
• Low core loss steel grade reduces standing loss on equipment that runs continuously, cutting running cost over the service life.
• Enclosure ventilation is arranged around the coil legs so heat leaves the housing instead of accumulating around the windings.
• Vacuum impregnation locks the turns in place, reducing audible hum and preventing conductor movement under short circuit forces.
• Engineering support on impedance selection, harmonic analysis and cable length evaluation for your specific drive and motor combination.
• Cross reference support: send the existing part number, drawing or nameplate photo and we will propose a mechanically and electrically compatible alternative.

5. FAQ

Q1: Are you a factory or a trading company?
A1: We are a manufacturer. We operate our own 10,000 sqm production base in Dongguan, Guangdong, China, with 8 complete production lines and in-house R&D and QC teams.

Q2: What is the difference between an input reactor and an output reactor?
A2: An input reactor sits between the mains and the drive. It limits inrush and surge current into the rectifier and reduces the harmonic current drawn from the supply. An output reactor sits between the drive and the motor. It reduces dv/dt stress on the motor insulation and limits the capacitive charging current of long motor cables. The construction is similar but the design targets are different, so please tell us which side it will be installed on.

Q3: How do I choose the impedance percentage?
A3: 2% to 3% is common where the main purpose is surge protection and moderate harmonic reduction. 4% to 5% gives stronger harmonic attenuation but a larger voltage drop. 7% is normally used for detuned capacitor banks. Tell us the drive rating, the supply short circuit capacity and the harmonic limit you must meet, and we will recommend a value.

Q4: What payment terms do you accept?
A4: We accept T/T, PayPal and Western Union.

Q5: What information do you need to quote?
A5: Rated voltage, rated current or drive power, frequency, required inductance or impedance percentage, application side (input, output, DC link or filter), enclosure requirement, terminal type and any dimensional limit. A drawing or a photo of the nameplate you are replacing is also sufficient in most cases.

Q6: Can you supply an open frame version without the enclosure?
A6: Yes. The same electrical design can be supplied as an open frame IP00 unit for installation inside a customer cabinet, or in a ventilated enclosure with mounting feet as shown. Terminal position and mounting hole pattern can be adjusted to your layout.

Q7: Which certifications do you have?
A7: We hold ISO 9001 and ISO 14001 system certification. Product certifications including CE, CB, UL, cUL and RoHS are available. Please tell us your target market so we can confirm the applicable scope for your model.

Q8: What testing is performed before shipment?
A8: Each unit is checked for inductance per phase, DC resistance, phase balance, dielectric strength and insulation resistance, with a temperature rise test performed on the qualification sample. Results are recorded under our ISO 9001 quality system.

Q9: Why does a reactor hum, and how is it controlled?
A9: Audible noise comes from magnetostriction in the core and from movement of the turns. We control it with tight core clamping, controlled gap construction and vacuum varnish impregnation of the coils. If your installation has a specific noise limit, tell us the value and we will design against it.

Q10: How are the products packed and shipped?
A10: Units are fixed on a wooden pallet or in a plywood case with foam protection around the terminals and enclosure. We ship by sea for larger quantities and by air or express for samples, and we support DDP and DDU terms.

Q11: Do you have overseas warehouses or dropshipping service?
A11: We do not operate overseas warehouses and do not provide dropshipping. All goods are shipped directly from our factory in China.

Q12: What if there is a quality problem after delivery?
A12: Please provide the serial or batch number, the installation conditions and failure photos or measurement data. Our QC and R&D teams will analyse the case, issue an analysis report and agree a replacement or corrective action plan with you.