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Message: <blockquote data-quote="RandyDSok" data-source="post: 174051" data-attributes="member: 201">40a is 40 amps... ie the max burst amperage the ESC can handle. Voltage is another aspect you'll need to know as is whether it's for a brushed ( as you stated ) or brushless motor.  Brushed ESC's/motors use 2 wires and brushless ones use 3 wires going to the motor from the ESC. Size is the last aspect you must consider so what you get isn't too large for the location it is placed in. Additional info... burst amperage is the amount of current the ESC can handle for just a few seconds as apposed to continuously ( which is lower ) which would be better to know but few ever list it.</blockquote>