COOPER BUSSMANN GDB-4A Fuse, 4A, GDB, 250VAC, PK 5. More details: Fuse, 4A Fuse Amps, Indicating, GDB Series, 250VAC Voltage Rating, Fast Acting, Single Element, Body Material Glass, Nonrejection, Body Style Cylindrical, Interrupt Rating 35A at 250VAC, Length 20mm, Diameter 5mm, Functionally Equal To Mersen/Gould GSB, Standards CE, UL Guide JDYX2, Package Quantity 5