I've got a Lennox that did that. Took out the wiring to the condenser fan motors and wrapped them and the belt around the motor shaft. When it shorted it took out the fan relay, 1st stage compressor contactor and the control board. 460v on the control side isnt too good.
i've seen that happen on a new rooftop unit where the balancing guy had opened the motor pulley to the point the belt wedged in the pulley and then snapped. took out a lot of control wires. It looks to me like the motor pulley is opened up too far in this unit also, you might consider putting a smaller pulley on it
good observation, included in repair was a new sheave... yet adjusted much further closed
If you close it up you are going to speed your fan up, you will get more air flow and a higher amp draw. I would put the new belt on it with the old pulley and amp the motor and then put a smaller pulley on it and adjust it until your amp draw is the same as it was with the original.