Bussmann NBB Series Fast-Actin...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$2,421.67
Bussmann NBB Series Fast-Acting Current-Limiting Fuse, 1500V

Bussmann NBB Series Fast-Acting Current-Limiting Fuse, 1500V

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Model: NBB-125

In Stock (leaves warehouse same day if ordered before 3pm ET)

$2,421.67
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Bussmann NBB Series Fast-Acting Current-Limiting Fuse, 1500V

The Bussmann NBB Series, from Eaton Bussmann, is a fast-acting, current-limiting fuse line rated 1500V and built in a single-barrel body for reliable overcurrent protection. This family is available in amp ratings from 25A to 125A (25A, 35A, 40A, 50A, 70A, 80A, and 125A), giving specifiers a wide range of options while every fuse in the series shares the same 1500V rating, fast-acting response, and current-limiting construction. The non-indicating design keeps the NBB series consistent with standard Bussmann fuse styling across the full amp rating lineup.

Key Features

  • Amp Rating Range: Available in 25A, 35A, 40A, 50A, 70A, 80A, and 125A ratings, so the correct fuse can be matched to the circuit's load requirements.
  • Fast-Acting Response: Fast-acting element design responds quickly to overcurrent conditions to help protect connected equipment.
  • Current-Limiting Construction: Current-limiting operation reduces let-through energy, helping protect downstream conductors and equipment during a fault.
  • High Voltage Rating: Rated 1500V, suited for higher-voltage electrical distribution and equipment protection applications.
  • Single-Barrel Body: 1-barrel construction consistent across the NBB series lineup.
  • Non-Indicating Design: Standard non-indicating fuse body with no blown-fuse indicator window.

Technical Specifications

  • Voltage Rating: 1500V
  • Fuse Indicator: Non Indicating
  • Packaging Type: Standard
  • Product Length Depth: 2.5 in
  • Product Width: 12 in
  • Product Height: 2.5 in
  • Product Weight: 2.1 lb
  • Compliances: Contact factory

Typical Applications

  • Industrial Power Distribution Systems
  • Motor and Feeder Circuit Protection
  • Switchgear and Panelboard Overcurrent Protection
  • High-Voltage Electrical Equipment Protection
  • Commercial and Industrial Electrical Installations

Why Bussmann?

Bussmann by Eaton is a long-trusted name in circuit protection, and the NBB series reflects that with a durable single-barrel body, fast-acting and current-limiting performance, and a 1500V rating built for demanding electrical systems. With amp ratings spanning 25A to 125A in one series, electrical professionals can standardize on the NBB line for consistent, code-compliant overcurrent protection across multiple circuit sizes.

Manufacturer Resources

Product Specs

Packaging Type:
Standard
Department:
Electrical
Fuse Indicator:
Non Indicating
Product Length Depth:
2.5 in
Product Weight:
2.1 lb
Voltage Rating:
1500V
Product Width:
12 in
Compliances:
Contact factory
Product Height:
2.5 in
Product Type:
Fast-Acting Fuse
Series:
NBB
Amperage Rating:
25A - 125A
Product Group:
Circuit Protection
Product Subgroup:
Fuses
Product Length:
2.5 in

Bussmann NBB-125 – Frequently Asked Questions

1) What amp ratings does the Bussmann NBB fuse come in?
Seven ratings in the NBB line: 25A, 35A, 40A, 50A, 70A, 80A and 125A, ordered as NBB-25, NBB-35, NBB-40, NBB-50, NBB-70, NBB-80 and NBB-125. Every one of them carries the same 1500V rating and the same fast-acting, current-limiting element, so you pick purely on the circuit load and keep one series across several circuit sizes. Note there is no 100A step between 80A and 125A.
2) Is the NBB fuse rated high enough for a 1000V or 1500V DC solar string circuit?
The NBB series is rated 1500V, so it covers circuits up to that voltage. A fuse may always be applied at or below its voltage rating, so a 1000V system is within range as well. Undervoltage is never the problem with fuses; applying one above its rating is. The series is fast-acting and current-limiting, which keeps let-through energy down on the conductors and equipment downstream of a fault.
3) Is the Bussmann NBB a time-delay fuse or fast-acting?
Fast-acting. The NBB element clears quickly on overcurrent, which suits feeder, switchgear and general equipment protection but is not what you want ahead of a motor whose inrush would nuisance-blow it. For motor starting current you want a time-delay (dual-element) fuse sized for the locked-rotor draw.
4) Will I be able to tell by looking whether an NBB fuse has blown?
No. The NBB body is non-indicating, with no blown-fuse window or pop-out pin. Troubleshooting means metering across the fuse or pulling it and checking continuity. If your maintenance crew relies on a visual check down a row of holders, specify an indicating-style fuse instead.
5) Why choose a current-limiting fuse like the NBB over a standard non-current-limiting one?
Current-limiting operation cuts the fault current off before it reaches its first peak, which reduces the let-through energy your conductors, busbar and connected equipment absorb during a short circuit. On a high-voltage distribution system that is the difference between a cleared fault and collateral damage. A non-current-limiting device lets the full available fault energy through for a full half cycle or more.
6) Can I standardize my facility on the NBB series across different circuit sizes?
That is the practical argument for it. One series covers 25A through 125A with identical voltage rating, body style and non-indicating construction, so an MRO stockroom carries one family in seven amp ratings rather than several product lines. It also means a technician pulling a spare does not have to verify voltage class each time, only the amp rating stamped on the barrel.
7) How much does an NBB fuse weigh and how big is the shipped item?
Each NBB fuse is listed at 2.1 lb, with dimensions of 12 in, 2.5 in and 2.5 in. That weight and bulk matter if you are hanging several in a holder assembly or planning a panel layout, since these are a substantially larger body than a typical low-voltage class fuse.
8) Where is the NBB fuse typically used?
Industrial power distribution, feeder circuits, switchgear and panelboard overcurrent protection, and higher-voltage equipment protection in commercial and industrial installations. It is a distribution-side fuse, not a control-circuit or branch-appliance part.
9) How do NBB fuses ship, individually or in a multi-pack?
Packaging is standard for the series, so you order by the amp rating you need (for example NBB-70 for 70A) rather than selecting a pack configuration. Each amp rating is its own part number.
How fast can I get the Bussmann NBB-125 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Bussmann NBB-125 come with a warranty?
Absolutely. The Bussmann NBB-125 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Bussmann NBB-125?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the Bussmann NBB-125 from ZenSupply?
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