Bussmann SR-5F-4A-BK Sub-Miniature Fast-Acting Fuse, 4A/250V

Bussmann Sub-Miniature Fast-Acting Fuse

The Bussmann Sub-Miniature Fast-Acting Fuse, part of the Eaton Bussmann series, is a compact overcurrent protection device rated 4A at 250V, engineered to protect against harmful overcurrents in sensitive electronic and control circuits. Designed for socket mounting with radial leads, it delivers a 50 kAIC interrupt rating at 250 Vac and is rated for operation across a wide -40° to 125°C temperature range, making it a dependable choice for demanding low-voltage equipment.

Key Features

• Amperage Rating: 4A for precise overcurrent protection in low-current circuits.
• Voltage Rating: 250V, suited to standard control and electronic power circuits.
• Interrupt Rating: 50 kAIC at 250 Vac for reliable clearing of fault currents.
• Fast-Acting Response: Opens in 4 hrs. minimum at 100%, 10 mins. maximum at 150%, and 2 mins. maximum at 200% of rated current.
• Mounting: Socket-mount design with radial leads for straightforward installation and replacement.
• Fuse Indicator: Non-indicating construction.
• Operating Temperature: Rated -40° to 125°C for reliable performance across temperature extremes.
• Compact Form Factor: Sub-miniature body sized for space-constrained circuit board and panel layouts.

Technical Specifications

• Amperage Rating: 4A
• Application: Protects against harmful overcurrents
• Frequency Rating Maximum: 50 HZ
• Fuse Indicator: Non Indicating
• Interrupt Rating: 50 kAIC at 250 Vac
• Melting L2t: Typical melting: 35.4 I2t (10 in) at 1mS
• Operating Temperature: -40° to 125°C
• Packaging Type: Standard
• Resistance: Typical DC cold: .026 ohms
• Response Time: 4 hrs. minimum at 100%, 10 mins. maximum at 150%, 2 mins. maximum at 200%
• Used With: Radial leads
• Voltage Drop: Maximum: 330 mV at 1 in*
• Voltage Rating: 250V
• Product Type: Sub miniature
• Product Length: .343 IN
• Product Details: Sub miniature
• Product Diameter: .6 IN
• Mounting Method: Socket
• Item Quantity: in bulk 200 per bag
• Product Height: .307 IN
• Product Weight: .1 LB
• Product Width: .343 IN

Typical Applications

• Electronic Circuit Overcurrent Protection
• Industrial Control Panels and OEM Equipment
• Socket-Mounted Fuse Holder Assemblies
• Low-Voltage Control and Signal Circuits
• Space-Constrained Panel and Board-Level Layouts

Why Bussmann?

Bussmann, part of Eaton, engineers this sub-miniature fast-acting fuse with a 50 kAIC interrupt rating, a defined response-time profile, and a -40° to 125°C operating range to deliver dependable overcurrent protection for demanding electronic and control applications. Socket mounting with radial leads simplifies installation and field replacement, giving professionals a trusted, code-conscious fuse solution backed by the Bussmann name.