The first rating is the continuous Current and the second is the Motor Starting Current See motor rating chart below on product files To avoid nuisance fuse-link operation due to overcurrent starting surges, fuse-links used in motor circuits often require higher ratings than the full load current of the motor. Motor circuit protection fuse-links have a dual current rating, consisting of a continuous current rating and a rating relating to the operational characteristics. The letter ‘M’ separates these two ratings, for example, 20M32. This represents a fuse-link with a maximum continuous current rating of 20Amps, and an operational characteristic of 32 Amps rating to meet the motor starting current.
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