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80 ton = 100 amp 240/208 volt 3 phase 10 ton = 30 amp 20 ton = 60 amp ... HP, DC/AC motors, wound rotors, it would be impossible to narrow it down. If someone who works more with DC cranes would chime in maybe get a little closer for you? most of the ones I have worked on were 100 ton + although we did have some smaller ones in the …