AMP-TRAP AG FUSES FIT RIGHT IN TO A WIDE VARIETY OF INDUSTRIAL APPLICATIONS The Ferraz Shawmut Amp-trap AG fuse series is a complete line of Class G fuses. With time delay (above 5A rating), AG fuses safely fit a wide variety of applications. Class G fuses are made in four physical sizes and provide good branch-circuit protection for lighting, heating, and appliance circuits.