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This Bussmann FMX-40 is a 40-amp slow-blow MAXI fuse built for circuits that need higher amperage protection without giving up the compact footprint of the MAXI form factor.
It follows standard green color coding for 40-amp fuses and includes a viewing window so you can check its status without pulling it.
A correctly rated MAXI fuse like this protects higher-draw circuits without adding bulk to your fuse panel.