The type of fire extinguisher that would be used on an electric motor that has overheated and caught fire is a CO² fire extinguisher.
CO² fire extinguishers should be used to put out electrical fires. They assist to smother the fire and prevent it from spreading by displacing the oxygen in the air while leaving no residue and so being safe to electrical equipment.
Whenever there is a case of fire from electricity, water is not used in such conditions, this is because water is a good conductor of electricity. If the water comes in contact with the electricity it can cause new problems.
Therefore, the type of fire extinguisher that would be used on an electric motor that has overheated and caught fire is a CO² fire extinguisher.
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