Enamelled Rectangular Aluminium Winding Wires are speciality conductors engineered for modern electrical machines that require high thermal endurance, strong mechanical strength, and excellent insulation stability. These wires are made from high-purity aluminium, shaped precisely into rectangular profiles, and coated with multi-layer enamel insulation to ensure superior electrical reliability.
At Bharat Insulation Company, we are a trusted aluminium winding wire manufacturer known for producing export-quality aluminium winding wire that meets international standards like IEC-60317, NEMA, and IS 13730. Our wires are widely preferred by global electrical OEMs for their performance, durability, and cost efficiency.
These conductors are also commonly called:
These are high-purity aluminium conductors flattened into a rectangular shape and coated with high-temperature enamel paint (single or dual layer). The rectangular profile provides a better space factor and more conductor in a fixed slot area, increasing the efficiency of transformers and rotating machines.
This makes them the best aluminium winding wire for transformers and heavy-duty electrical equipment.
| Specification Standard (Ref) | NEMA MW-18 A | IEC-60317-16 | IEC-60317-28 | IEC-60317-29/NEMA MW-36C | NEMA MW-36 A | IS13730 PART-47 |
|---|---|---|---|---|---|---|
| Thermal Class | 105°C | 155°C | 180°C | 200°C | 220°C | 240°C |
| Chemical Base Of Base Coat | Polyvinyl Acetal | Modified Polyester | Polyester imide | Polyester imide | Polyesterimide | Aromatic Polyimide |
| Chemical Base Of Top Coat | - | - | - | Polyamide-imide | Polyamide-imide | - |
| Range of Wire (Area) | Cross section area 10.0 to 60 mm2 | |||||
| Thickness | 2-5 mm | |||||
| Width | 5-12 mm | |||||
| Increase in Dimension Due to Insulation (mm) | ||||||
| IEC 60317 Grade 1 | 0.060 to 0.110 | |||||
| IEC 60317 Grade 2 | 0.120 to 0.170 | |||||
| NEMA 1000 Quadruple | 0.127 to 0.178 | |||||
| Standard Colour | Brown | Brown | Brown | Brown | Brown | Brown |
| Technical Properties As Per IEC- 60317-0-2 | ||||||
| Flexibility & Adherence | ||||||
| Mandrel Bending on Thickness & Width | 3-4 T & 4-5 W | 3-4 T & 4-5 W | 3-4 T & 4-5 W | 3-4 T & 4-5 W | 3-4 T & 4-5 W | 3-4 T & 4-5 W |
| Adherence (no crack after stretching %) | 15 | 15 | 15 | 15 | 15 | 15 |
| Heat Shock (no cracks after bending on Thickness/ Temp.°C) | 10 % Streching, 150 ºC | 6 T/175 | 6 T/200 | 6 T/220 | 10 % Streching, 240 ºc |
6 T/260 |
| Breakdown Voltage at Room Temp.( Volts min.) | >2000 V | >2000 V | >2000 V | >2000 V | >2000 V | >2000 V |
| Resistance To Hot Transformer Oil | Excellent | Not applicable | Excellent | Excellent | Excellent | Excellent |
| Heat Bonding Temperature/ Time (°C) | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable |
| Special Characteristics & Application | Very high Mechanical properties, good transformer oil resistance | High thermal, mechanical, electrical and chemical resistance | High thermal, electrical and mechanical, properties, excellent heat shock & burnout | Very high thermal properties | Very high thermal properties | Very high thermal properties & Mechanical properties |
| Special Notes | Suitable for 130 hermatic application used in oil filled transformers & equipments running with high mechanical properties such as auto electricals. | Large rotating machines such as: AC motors, DC motors, HV motors etc. | Large and special electrical machines such as: generators, alternators, AC/DC motors, HV motors, dry type transformers, inductor coils, etc. | Special electrical machine and magnet coils for aerospace industry | Special electrical machine and magnet coils for aerospace industry | Designed for using of conductor for product with maximum value of the thermal & mechanical characteristics |
| Thickness | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| mm | 0.80 | 0.90 | 1.00 | 1.12 | 1.25 | 1.40 | 1.60 | 1.80 | 2.00 | 2.24 | 2.50 | 2.80 | 3.15 | 3.55 | 4.00 | |
| Corner Radius* | Corner Radius 0.50 mm | Corner Radius 0.65 mm | Corner Radius 0.800 mm | 1.00 | ||||||||||||
| Width | ||||||||||||||||
| 2.00 | 1.463 | 1.626 | 1.785 | 2.026 | 2.286 | 2.586 | - | - | - | - | - | - | - | - | - | |
| 2.24 | 1.655 | 1.842 | 2.025 | 2.294 | 2.586 | 2.922 | 3.370 | - | - | - | - | - | - | - | - | |
| 2.50 | 1.863 | 2.076 | 2.285 | 2.586 | 2.911 | 3.286 | 3.786 | 4.138 | - | - | - | - | - | - | - | |
| 2.80 | 2.103 | 2.346 | 2.585 | 2.922 | 3.286 | 3.706 | 4.266 | 4.678 | 5.238 | - | - | - | - | - | - | |
| 3.15 | 2.383 | 2.661 | 2.935 | 3.314 | 3.723 | 4.196 | 4.826 | 5.308 | 5.938 | 6.694 | - | - | - | - | - | |
| 3.55 | 2.703 | 3.021 | 3.335 | 3.762 | 4.223 | 4.756 | 5.466 | 6.028 | 6.738 | 7.590 | 8.326 | - | - | - | - | |
| 4.00 | 3.063 | 3.426 | 3.785 | 4.266 | 4.786 | 5.386 | 6.186 | 6.838 | 7.638 | 8.598 | 9.451 | 10.651 | - | - | - | |
| 4.50 | 3.463 | 3.876 | 4.285 | 4.826 | 5.411 | 6.086 | 6.986 | 7.738 | 8.638 | 9.718 | 10.701 | 12.051 | 13.626 | - | - | |
| 5.00 | 3.863 | 4.326 | 4.785 | 5.386 | 6.036 | 6.786 | 7.786 | 8.638 | 9.638 | 10.838 | 11.951 | 13.451 | 15.201 | 17.201 | - | |
| 5.60 | 4.343 | 4.866 | 5.385 | 6.058 | 6.786 | 7.626 | 8.746 | 9.718 | 10.838 | 12.182 | 13.451 | 15.131 | 17.091 | 19.331 | 21.542 | |
| 6.30 | 4.903 | 5.496 | 6.085 | 6.842 | 7.661 | 8.606 | 9.866 | 10.978 | 12.238 | 13.750 | 15.201 | 17.091 | 19.296 | 21.816 | 24.342 | |
| 7.10 | - | 6.216 | 6.885 | 7.738 | 8.661 | 9.726 | 11.146 | 12.418 | 13.838 | 15.542 | 17.201 | 19.331 | 21.816 | 24.656 | 27.542 | |
| 8.00 | - | - | 7.785 | 8.746 | 9.786 | 10.986 | 12.586 | 14.038 | 15.638 | 17.558 | 19.451 | 21.851 | 24.651 | 27.851 | 31.142 | |
| 9.00 | - | - | - | 9.866 | 11.036 | 12.386 | 14.186 | 15.838 | 17.638 | 19.798 | 21.951 | 24.651 | 27.801 | 31.401 | 35.142 | |
| 10.00 | - | - | - | - | 12.286 | 13.786 | 15.786 | 17.638 | 19.638 | 22.038 | 24.451 | 27.451 | 30.951 | 34.951 | 39.142 | |
Our insulated rectangular aluminium wire is used in:
For heavy-load applications, it is considered the best aluminium winding wire for transformers.
Enamelled rectangular aluminium winding wires are widely used in power transformers, distribution transformers, alternators, motors, inductors, chokes, dry-type transformers, and magnet coils. Their rectangular design offers a higher space factor and better heat dissipation compared to standard round wires.
The enamelled aluminium conductor price depends on specification, insulation grade, thermal class (105°C to 240°C), thickness, and cross-sectional area. Prices vary for export-quality aluminium winding wire, and bulk buyers can get competitive rates under wholesale aluminium winding wire supply.
These wires provide higher slot fill, better coil strength, uniform enamel coating, excellent thermal class performance, and low power loss - making them the best aluminium winding wire for transformers. Their rectangular shape enables compact coil design with improved electrical and mechanical stability.
Yes. High-quality products from leading aluminium winding wire manufacturers are produced as per NEMA MW-18A, NEMA MW-36C, IEC-60317-16, IEC-60317-28, IEC-60317-29, and IS 13730-47 standards. They offer >2000V breakdown voltage, excellent oil resistance, high flexibility, strong adhesion, and premium enamel durability.
