As far as the most Traction motors and Generators at this industry are "H" class (180°C) with Arch bound Commutators (steel V-Rings), so the Copper bars should be made of Silver Copper alloy with proper hardness.

These Commutators will be provided as 'full commutator'(with steel parts) or 'Copper Mica pack' (without steel parts) forms.

Commutators of D77 Traction motor

Commotator of 18kW auxiliary Generator