Bussmann T-4 Time-Delay Dual-Element Plug Fuse

Bussmann T-4 Type T Time-Delay Dual-Element Plug Fuse, 4A 125VAC

The Bussmann T-4 is an Eaton Bussmann series Type T plug fuse built for heavy-duty, time-delay overcurrent protection in plug-fuse panelboards. This dual-element fuse is rated 4A at 125VAC and delivers a 10kAIC (RMS Symmetrical) interrupt rating along with a 10kA short circuit rating, giving installers and facility maintenance teams a dependable replacement option for legacy panels that still rely on Type T threaded plug fuses. The time-delay, dual-element construction allows the T-4 to ride through momentary overload conditions, such as motor starting inrush, without nuisance tripping, while still opening quickly on sustained overloads and short-circuit fault currents. The threaded mount base allows the fuse to thread directly into a compatible Type T plug-fuse holder, making replacement fast and straightforward without special tools.

Key Features

• Amperage Rating: 4A rating is sized for branch-circuit and equipment overcurrent protection in plug-fuse panelboards.
• Voltage Rating: 125VAC rating matches standard residential and light commercial plug-fuse panel voltage.
• Time-Delay Operation: time-delay characteristic allows the fuse to hold through brief overload conditions, such as motor starting inrush current, reducing nuisance opening.
• Dual-Element Construction: dual-element design combines a short-circuit element with a thermal overload element for balanced protection against both fault currents and sustained overloads.
• Heavy Duty Rating: heavy-duty classification supports demanding overcurrent protection duty where reliable performance is required.
• Interrupt Rating: 10kAIC (RMS Symmetrical) interrupt rating supports dependable fault clearing on high fault-current circuits.
• Short Circuit Rating: 10kA short circuit rating provides an added layer of protection against damaging fault currents.
• Threaded Mount: Type T threaded base installs directly into compatible Type T plug-fuse holders for quick, tool-free replacement.

Technical Specifications

• Refer to manufacturer documentation for complete technical specifications.

Typical Applications

• Residential and Light Commercial Plug-Fuse Panels
• Legacy Panelboards Using Type T Threaded Fuse Holders
• Motor and Equipment Circuits Requiring Time-Delay Protection
• Branch Circuit Overcurrent Protection
• Replacement Fuse for Existing Type T Fuse Holders

Why Bussmann?

Bussmann by Eaton has long been a trusted name in circuit protection, and the T-4 Type T plug fuse continues that reputation with time-delay, dual-element construction engineered for heavy-duty branch-circuit protection. Backed by a 10kAIC interrupt rating and a 10kA short circuit rating, this threaded-mount plug fuse gives electrical contractors and facility maintenance teams a dependable, code-compliant replacement for panels that use Type T plug fuses, helping keep legacy electrical systems protected and operating safely.