What is enameled square copper wire?
Enameled square copper wire (also called square magnet wire) Is a high purity, square-shaped copper conductor coated with a thin layer of electrical insulation. The coating is an enamel polymer resin.
Enameled square copper wire, this is a type of conductor mainly used in the electrical and electronic fields for the purposes of transformers winding, inducers, inductor coils and chikes, motor wires, bus bars etc. Usually the shape of wire used is either square or round; it mainly depends on the usage.
This ring shape is better than the conventional round one as it can make the packs of winding more compact and efficient in electromagnetic devices.
Copper Square Magnet Wire technical spefications
| Name | Enameled Rectangular Copper Wire |
| Conductor | High-conductivity Copper |
| Thickness(a) | 0.45-6mm / custom size |
| Width(b) | 0.45-6mm / custom size |
| Typical Square Sizes | 0.45×0.45 to 6×6 mm |
| Insulation | UEW / PEW / EIW / AIW-EIW |
| Thermal Class | 120°C(Class E), 180°C(Class H), 200°C(Class C), 220°C(Class C+), 240°C(Class HC) |
| Insulation Thickness: | G1 / G2 / single build / heavy build |
| Standard | IEC / NEMA / JIS / GB |
| Certificate | UL, ISO |
| Packing | 30kg-150kg ply-wood spool(250*400 / 250*500/ 250*600/ 250*730) |
Packing of enameled square copper wire
Plywood wooden spool/bobbin, spool/bobbin common specifications: 250*400; 250*500; 250*600, one spool/bobbin wire weight 30~150kgs
Outer packing: pallet or plywood box, suitable for shipping by sea
| Reel Type | Range of Dimeter( mm) | Weight of Wire Spool (KG) | Diameter (mm) | |||||
| D1：Top Flange | D2：Bottom Flange | d1：Top Core | d2：Bottom Core | W | h(d3)：Center bore | |||
| 250*400 MDF wooden | 3.0~6.0 | 25~35 | 400±2.0 | 400±2.0 | 210±1.0 | 280±1.0 | 250±2.0 | 100±0.5 |
| 250*500 MDF wooden | 3.0~6.0 | 40~60 | 500±2.0 | 500±2.0 | 210±1.0 | 210±1.0 | 250±2.0 | 60±0.5 |
| 250*600 MDF wooden | 3.0~8.0 | 80~100 | 600±2.0 | 600±2.0 | 210±1.0 | 210±1.0 | 250±2.0 | 60±0.5 |
| 250*730 MDF wooden | 3.0~8.0 | 90~130 | 730±2.0 | 730±2.0 | 210±1.0 | 210±1.0 | 250±2.0 | 60±0.5 |
| 250*730 MDF wooden | 3.6~8.0 | 110~140 | 730±2.0 | 730±2.0 | 210±1.0 | 210±1.0 | 250±2.0 | 60±0.5 |
| 500*500 MDF wooden | 1.0~8.0 | 100~120 | 500±2.0 | 500±2.0 | 210±1.0 | 210±1.0 | 500±2.0 | 60±0.5 |
Application of Enameled Square Copper Wire
Power Transformers
For high-current transformer windings where conductor packing and winding efficiency are important.
Electric Motors
Used in stator and rotor winding applications requiring compact conductor arrangements.
Generators
Suitable for generator windings where thermal and mechanical performance are critical.
Reactors & Inductors
Used in high-current magnetic components.
EV & Automotive
For selected traction motor and high-power electrical applications.
Industrial Electrical Equipment
Suitable for motors, generators, UPS systems and other electrical equipment.
Why Choose LP Enameled Square Copper Wire?
Key Structural & Technical Features
Square Profile: gets rid of the vacant gaps present with round wire when winding into coils, so the true space factor or slot fill factor can be as high as 90% or more.
Insulating Coating: Enamel polymer (Polyesterimide, Polyimide, or polyamide-imide) coated at high temperature in order to avoid short circuits with minimum overhead.
Rounded Corners (Blend Radii): The shape of corners shall be controlled such that the entire surface of the enamel coating can be maintained more or less uniform without thin spots or breakdown under electric stress.
Core Advantages
Higher Space Efficiency Maximize the amount of copper in a given space of magnetic core slot compared to round wire;
Great heat dissipation-the coil can expel heat much quicker due to the flat contact surface to surface contact between turns.
Power Density Improvements: Allows for more compact and increased- power motors, transformers and inductors.
Customized Enameled Square Copper Wire
We manufacture square copper magnet wire according to customer drawings, winding requirements and applicable standards.
Customizable Parameters
Conductor width
Conductor thickness
Corner radius
Insulation thickness
Insulation type
Thermal class
Grade 1 / Grade 2
Heavy build
Self-bonding coating
Spool size
Packaging
Applicable standard
Send us your drawing or specifications for a customized recommendation.
