5hp Single Phase motors tripping breaker(s)

Have a 60gal compressor. Aside from a new 5hp WEG motor working for about an hour, 3 other single phase motors have either failed to start or immediately trip either a dedicated 40amp or 50amp breaker. The one motor that worked for a short time just started tripping the breaker on start up. The line voltage is 123-124ac or 246V or 248vac. Unsure of where to go from here. Obviously not a motor problem in that the motors trip the breaker or fail to start even without the compressor belt installed

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