Class 200 double coated aluminum round wire is selected for coils that need higher thermal margin and stronger enamel protection than basic winding wire. Double coating can improve insulation build and abrasion resistance, but it also increases outside diameter. Buyers must check whether the coated wire still fits the coil window.

This wire may be used in high-temperature motors, transformers, heavy coils and industrial electrical devices. For related high-heat aluminum wire content, compare AIW 200 round wire enameled aluminum wire for motors and Class200 used in transformer aluminium winding wire.

What double coated means in practice

Double coated should be defined by enamel system, insulation build and outside diameter. It does not mean the wire can be used without coil testing. The final product still depends on winding tension, varnish, terminals, slot insulation and operating temperature.

Ask the supplier for breakdown voltage, pinhole, adhesion, flexibility and thermal class evidence. If the wire is used in a motor, run a temperature rise test after winding and varnish curing.

Specification checklist

Application case

A coil factory upgraded from Class 180 to Class 200 double coated aluminum wire for a hotter motor winding. The first sample improved insulation margin but reduced slot fill because the outside diameter was larger. The winding design was adjusted and the second trial passed temperature rise testing.

For a similar double-wire motor insulation topic, see 180 class aluminum insulated double wire for motors.

FAQ

Is Class 200 always better?

Not always. It helps thermal margin, but may increase cost and outside diameter.

What should be checked first?

Check outside diameter, breakdown voltage, winding fit and terminal reliability.

Can it replace copper wire?

Only after recalculating resistance and testing the finished coil.

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