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You must use one of four methods to protect the motor-compressor control apparatus, disconnecting means, and branch-circuit conductors against overload and failure to start [440.52(B)]. These are:
If you the overload relays and/or other devices you use for motor overload aren’t capable of opening a short circuit, you must provide protection for those devices [440.53]. The protection must be fuses or inverse time breakers with ratings or settings that comply with Article 440, Part III. The exception to this last requirement is if those overload protection devices are identified for group installation or for part-winding motors and are marked to indicate the maximum size of fuse or breaker protecting them.