Did I read correctly in that the green light stayed on the entire time? That is, even though the gear by visual inspection wasn't in the extended position?
One thing I would have tried given your description, was to turn off the master (and alternators) and then pumped the gear down manually. This is a method described in the handbook and will help in the case of mis-rigged downlocks.
Need a little more precise description of exactly what happened to get much closer to the cause, though on the face of it, the fact that the gear motor kept blowing the circuit breaker says that it was drawing a high current...
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