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What is the true rating on a 9422ATF13 device? Is it a 200A device or a 400A? Can I use larger fuses?

This is a 200A fusible switch with 400A fuse clips. It is a 200A disconnect switch with horsepower ratings equivalent to a non-fused 200A switch. Overfusing is permitted by the NEC and is sometimes required to accomodate the 175% rule when sizing the power fuses. Sometimes the upper horsepower ratings for a particular NEMA size category will result in requiring the next larger fuse size when the FLA of the motor is mutilpied by 175%.

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