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Bussmann FWP-70 Eaton Series High-Speed Fuse, 250 Vac/dc, Non-Indicating
Model: BUSS-FWP-70
Bussmann FWP-70 Eaton Series High-Speed Fuse, 250 Vac/dc, Non-IndicatingThe Bussmann FWP-70 is an Eaton Bussmann series FWP high-speed fuse rated 250 Vac/dc, built in a Non-Indicating, Standard...
Bussmann
$716.09
Bussmann FWP High-Speed Fuse, 700V AC/DC, Standard
The Bussmann FWP High-Speed Fuse, 700V AC/DC, Standard is an Eaton Bussmann series fuse engineered for demanding overcurrent protection duty in power circuits. This FWP series carries a dual voltage rating of 700 Vac and 700 Vdc, giving specifiers a single fuse platform that can be applied to both AC and DC circuits without switching product lines. The fuse is offered in Standard speed construction, and the FWP series spans amp ratings from 80A through 450A — specifically 80A, 125A, 200A, 250A, 300A, and 450A — so the correct rating can be matched to the connected load and available fault current. Select the amp rating that fits your specific application from the options offered on this product page, and consult Eaton Bussmann documentation to confirm proper coordination with upstream and downstream protective devices.
Key Features
- Dual Voltage Rating: Rated 700 Vac and 700 Vdc, allowing the FWP series to protect both AC and DC power circuits with one fuse platform.
- Amp Rating Range: Available in 80A, 125A, 200A, 250A, 300A, and 450A ratings, so the fuse can be matched to the specific circuit load and application.
- High-Speed Fuse Construction: Standard speed FWP design engineered for fast-clearing overcurrent response and consistent time-current characteristics.
- Bussmann FWP Series: Part of the Eaton Bussmann FWP high-speed fuse series, providing a consistent, repeatable platform across the full amp rating range.
- Standard Speed Type: Configured as a Standard speed fuse within the FWP product line for applications that call for this speed classification.
- Single-Series Sourcing: Covering 80A to 450A under one series simplifies stocking and cross-referencing for electrical distributors and panel builders.
Technical Specifications
- Series: Bussmann FWP
- Voltage Rating: 700 Vac / 700 Vdc
- Amp Rating Options: 80A, 125A, 200A, 250A, 300A, 450A
- Speed Classification: Standard
- Compliances: Contact factory
Typical Applications
- Power Electronics and Semiconductor Protection
- Motor Drives and Variable Frequency Drives (VFDs)
- Industrial Control Panels and Switchgear
- Rectifier and Power Conversion Circuits
- Combined AC and DC Power Distribution Systems
- Industrial and Commercial Overcurrent Protection
Why Bussmann?
Bussmann is the Eaton fuse brand that electrical professionals specify for dependable overcurrent protection, and the FWP series continues that standard with a dual 700 Vac/700 Vdc rating built into a Standard speed platform. Having one series span 80A through 450A simplifies sourcing, stocking, and cross-referencing for electrical contractors, panel builders, and distributors who need consistent, code-compliant protection across multiple circuit sizes. Choose the Bussmann FWP series for reliable, high-speed fuse performance backed by the Eaton Bussmann name, and contact the factory for complete compliance and application documentation.
Manufacturer Resources
Product Specs
- Department:
- Electrical
- Compliances:
- Contact factory
- Product Type:
- Semiconductor Fuse
- Series:
- FWP
- Voltage Rating:
- 700V AC/DC
- Amperage Rating:
- 80A - 450A
- Product Group:
- Circuit Protection
- Product Subgroup:
- Fuses
Bussmann FWP-125 – Frequently Asked Questions
1) What amp ratings does the Bussmann FWP high-speed fuse come in?
Orderable FWP ratings run from 25A up to 450A: FWP-25A22FI, FWP-30A14FI, FWP-32A14FI, FWP-40A22FI, FWP-63A22FI, FWP-80, FWP-90B, FWP-125, FWP-200, FWP-250, FWP-300 and FWP-450. The smaller ratings (25A through 63A) carry the A14FI and A22FI suffixes, so if you are replacing one of those, match the full part number and not just the amperage.
2) Can I use an FWP fuse on a DC bus, or is it AC only?
Both. The FWP series is rated 700 Vac and 700 Vdc, so the same fuse can go on the AC line side or on a DC link without changing product lines. That dual rating is why it shows up in rectifier and power conversion circuits as well as AC feeds.
3) Will a 700V fuse work on my 480V drive?
Yes, a fuse voltage rating is a maximum, not a target, so a 700 Vac/Vdc FWP applies on a 480V system. What it cannot do is go the other direction: do not use it above 700 volts on either AC or DC. Size the amp rating to the connected load and available fault current, and coordinate with the upstream and downstream devices.
4) Is a high-speed fuse like the FWP the right choice for protecting drive semiconductors, or should I use a standard branch-circuit fuse?
For semiconductor protection you want a high-speed (semiconductor) fuse, and that is what the FWP is. Diodes, IGBTs and SCRs fail on I2t long before a conventional branch-circuit or time-delay fuse clears, so the FWP's fast-clearing characteristic is what protects the silicon in motor drives, VFDs, rectifiers and power conversion stages. A standard branch-circuit fuse still has a place upstream for cable and general overcurrent duty, but it will not save a bridge.
5) What does the FWP 'Standard' speed designation mean when I am ordering?
Within the FWP high-speed line, Standard is the speed classification of these fuses, as opposed to other speed classes Bussmann offers in the semiconductor fuse family. If the drive manufacturer's manual calls out a specific speed class, match it, because the time-current curve is the whole point of a semiconductor fuse.
6) Is the FWP series a good fit for standardizing fuse stock across several panel sizes?
That is one of its practical advantages for panel builders and distributors: a single series covers 25A through 450A at one voltage rating, so cross-referencing and shelf stock stay in one family instead of spanning several product lines. Bear in mind the physical body and mounting differ across the range, so standardizing on the series simplifies sourcing, not holder interchangeability.
7) Does the amperage I need have to match the drive's input current exactly?
No, and matching it exactly is usually wrong. Semiconductor fuse selection works from the connected load, the available fault current, and the I2t withstand of the device being protected, which is why the FWP is offered in steps (80A, 125A, 200A, 250A, 300A, 450A at the upper end) rather than every value. Use the equipment manufacturer's recommended fuse rating where one is given and confirm coordination with the devices above and below it.
8) Where are Bussmann FWP fuses typically used?
Power electronics and semiconductor protection, motor drives and VFDs, industrial control panels and switchgear, rectifier and power conversion circuits, and combined AC/DC distribution. In short, anywhere the load contains solid-state devices that need clearing faster than a conventional fuse manages.
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Does the Bussmann FWP-125 come with a warranty?
Absolutely. The Bussmann FWP-125 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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