In article ,
says...
Hell. There were times in my past career when I would not even fuse a 10HP
440/460V motor. I would rather have it burn up than have a fuse blow at an
inopportune time. Example: an emergency ventilator in an explosive
atmosphere. When the LFL (lower flammability limit) reached 7.5% that motor
came on and ran until the environment was again safe or the motor destroyed
itself because of "whatever"!

That's not right, if the motor is drawing too much current, there is a
reason, and continued running will generate excessive heat, which is
worse on a vent for an explosive environment. Heck, even the heaters
could kick-out a motor before the fuses did in some cases - where the
fuses were sized wrong.

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