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Tripping the 120 is pretty hard through 'normal' operations (if there is such a thing), but not impossible, especially with tracks. Still, you may have an underlying problem aside from just drawing to much current through your motors. More detail about the drive train, what the 'bot was doing when it tripped or any thing else you might remember about it would help a lot.
Check for grounding to the frame with a multimeter from the battery terminals to the frame at several points.
Make sure all the 6 gauge wire connections are tight, clean and insulated. They come loose fairly often and should be checked frequently.
Check the breaker blocks- take out all the breakers, check for a loose fit, dirty contacts or anything out of the ordinary.
Also, check to see if any of the breakers are warm to the touch. If you pull enough to trip the 120 amp breaker then you should expect that the others be at least warm. Feel the red battery connector (assuming you use it), is it warm to the touch? Is the Battery warm?
At worse it's a fault to the frame or a defective main breaker. In any case, try to find a replacement for the breaker- if it smoked and smelled like it was melting then it is not reliable anymore.
-Andy A.
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