Bussmann W-4 Fast-Acting Edison Base Plug FuseThe Bussmann W-4 is an Eaton series W fast-acting plug fuse built for dependable overcurrent protection in standard Edison-base fuse holders. Rated 4 A at 125 Vac, this genuine Bussmann fuse combines a durable plastic body with a brass thread and a compact 1.16 in diameter for a secure fit in Edison-base panels. Backed by a 10 kAIC (RMS Symmetrical) interrupt rating and a 10 kA short circuit rating, it delivers the fast-acting response professionals rely on when protecting branch circuits from overcurrent conditions.Key FeaturesEdison Base Fit: Compact 1.16 in diameter Edison-base design fits standard plug fuse panels and holders.Durable Construction: Plastic body paired with a brass thread for reliable, long-lasting performance in the panel.Fast-Acting Element: Fast-acting fuse response reacts quickly to overcurrent conditions to help protect connected circuits.Amperage Rating: Rated 4 A at 125 Vac for accurate, application-matched circuit protection.Interrupt Rating: 10 kAIC (RMS Symmetrical) interrupt rating supports use in demanding fault-current environments.Short Circuit Rating: 10 kA short circuit rating provides an added margin of protection against fault events.Compact Footprint: Overall dimensions of 1.3 x 1.3 x 1.21 in make it a drop-in fit for existing Edison-base sockets.Technical SpecificationsRefer to manufacturer documentation for complete specifications.Typical ApplicationsResidential and Commercial Electrical PanelsEdison-Base Fuse Panel ReplacementOvercurrent Protection for Branch CircuitsLegacy Fuse Panel Maintenance and UpgradesGeneral Purpose Circuit ProtectionWhy Bussmann?Bussmann by Eaton is a long-trusted name in circuit protection, and this series W plug fuse reflects that reputation with its durable plastic body, brass thread, and fast-acting fuse element. Paired with a 10 kAIC interrupt rating and a 10 kA short circuit rating, it is engineered to deliver consistent, code-compliant overcurrent protection for the Edison-base panels found in professional electrical work.