Bussmann FWX-15A14F High-Speed...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$65.34
Bussmann FWX-15A14F High-Speed Cylindrical Semiconductor Fuse, 250V

Bussmann FWX-15A14F High-Speed Cylindrical Semiconductor Fuse, 250V

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Model: FWX-15A14F

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

$65.34
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Bussmann FWX-15A14F High-Speed Cylindrical Semiconductor Fuse, 250V

The Bussmann FWX-15A14F is a high-speed cylindrical fuse from the Eaton Bussmann series, engineered specifically for the protection of semiconductor devices such as diodes, SCRs, and thyristors in power conversion equipment. Rated at 250V, this fuse combines a compact cylindrical body with a fast-acting fuse element designed to respond quickly to damaging overcurrent conditions before they can reach and damage sensitive semiconductor components. Semiconductor fuses like the FWX-15A14F are commonly selected by electrical and controls engineers who need dependable protection for power semiconductor components in demanding operating environments. As part of the widely trusted Eaton Bussmann series lineup, the FWX-15A14F is built to deliver dependable, code-compliant circuit protection for demanding industrial and commercial power electronics applications.

Key Features

  • High-Speed Fuse Element: Fast-acting design responds rapidly to overcurrent events, helping to limit let-through energy and protect downstream semiconductor devices from damage.
  • Cylindrical Form Factor: Standard cylindrical body construction allows for straightforward installation into compatible fuse holders, blocks, and clips used in semiconductor protection circuits.
  • 250V Voltage Rating: Rated for 250V circuits, providing overcurrent protection suited to the intended semiconductor protection application.
  • Eaton Bussmann Series Engineering: Manufactured as part of the Eaton Bussmann series, a recognized source for industrial-grade circuit protection products.
  • Semiconductor Device Protection: Purpose-built as a semiconductor fuse to safeguard diodes, SCRs, thyristors, and similar power semiconductor components from fault current damage.
  • Application-Specific Design: Engineered as a semiconductor-class fuse rather than a general-purpose fuse, matching the fast-clearing protection characteristics required by sensitive power electronics.

Technical Specifications

  • Refer to manufacturer documentation for complete technical specifications.

Typical Applications

  • Power Electronics and Power Conversion Equipment
  • Variable Frequency Drives (VFDs)
  • SCR and Diode Protection Circuits
  • Rectifier Circuits
  • Industrial Motor Drive Systems
  • Industrial Control Panels

Why Bussmann?

Bussmann, part of the Eaton Bussmann series, is widely relied upon by electrical professionals for circuit protection products engineered to help safeguard equipment and maintain reliable operation. The FWX-15A14F high-speed cylindrical semiconductor fuse reflects that same focus on dependable, application-specific overcurrent protection, making it a practical choice for protecting semiconductor devices in 250V power electronics circuits. Choosing genuine Eaton Bussmann series components helps ensure consistent performance and compatibility with standard semiconductor fuse holders and protection schemes.

Manufacturer Resources

Spec Sheet

Product Specs

list_batch:
BUSS-20260919
Product Type:
Semiconductor Fuse
Voltage Rating:
250V
Configuration:
Cylindrical
Department:
Electrical
Product Subgroup:
Fuses
Product Group:
Circuit Protection
Product Length:
51 mm
Product Height:
14 mm
Product Width:
14 mm
Product Weight:
22.4 g
Amperage Rating:
15A

Bussmann FWX-15A14F – Frequently Asked Questions

1) Can I use the Bussmann FWX-15A14F in place of a standard fast-acting branch circuit fuse?
No. The FWX-15A14F is a semiconductor-class fuse, not a general purpose one. Its element clears much faster to limit let-through energy ahead of diodes, SCRs and thyristors. Swapping it into a general branch circuit or motor feeder role is the wrong application, and conversely a standard fast-acting fuse will not protect a power semiconductor. Match the fuse class to the duty.
2) What voltage circuit is the FWX-15A14F rated for?
250V. That makes it suited to 250V power electronics circuits such as rectifier sections, SCR and diode protection circuits, and lower voltage drive systems. If your bus or line voltage runs higher than 250V, this is not the fuse for that circuit.
3) Will the FWX-15A14F fit my existing fuse block or holder?
It uses a cylindrical body, so it mounts in the standard cylindrical holders, blocks and clips used for semiconductor fuse protection rather than bolt-in or blade style mounting. If your panel is fitted with bolted square-body semiconductor fuses, this is not a drop-in for those.
4) I need a semiconductor fuse for a 480V drive instead of a 250V one - what should I use?
The Bussmann FWX-15A14F is rated 250V, so it is not the right device for a 480V circuit. For higher-voltage power conversion equipment, step up to a Littelfuse L50S series very fast-acting semiconductor fuse rated 500V, or the L70S series rated 700VAC/650VDC for still higher bus voltages. All three are semiconductor-class fuses for SCR, diode and rectifier protection; the difference is the voltage class the body and element are designed to interrupt.
5) What is the closest cross-brand equivalent to the Bussmann FWX-15A14F semiconductor fuse?
The Bussmann FWX-15A14F is a high-speed cylindrical semiconductor fuse rated 250V. The nearest cross-brand match at the same voltage class is the Littelfuse L25S series semiconductor fuse, rated 250V, for example the L25S030 at 250V 30A. Both are semiconductor-class fuses intended to protect diodes, SCRs and thyristors rather than general-purpose branch circuits. Confirm the ampere rating and body dimensions you need before swapping, since the FWX-15A14F is a 15A cylindrical body and the L25S030 is a 30A device.
6) Can a Littelfuse L15S be used in place of a Bussmann FWX-15A14F?
No. The L15S series is a very fast-acting semiconductor fuse rated 150VAC/150VDC, while the Bussmann FWX-15A14F is rated 250V. Despite the similar "15" in the part numbers, the L15S designates the lower voltage class, not a 15A rating. For a 250V semiconductor protection circuit, stay with the FWX-15A14F or a 250V-class device such as the Littelfuse L25S series.
7) Is there another brand of 250V semiconductor fuse I could use instead of the Bussmann FWX?
Littelfuse builds the L25S series at the same 250V class, for example the L25S030 at 250V 30A. It is a comparable semiconductor fuse family, though the amp rating and let-through characteristics differ from a 15A FWX, so confirm the ampere rating matches the device you are protecting before substituting.
8) What exact part number should I order for this Bussmann semiconductor fuse?
Order Bussmann FWX-15A14F. That is the manufacturer part number for the 250V high-speed cylindrical semiconductor fuse in the Eaton Bussmann series. There is one model on it, so there are no finish or size options to specify.
9) Is a standard general-purpose 250V fuse an acceptable substitute for the Bussmann FWX-15A14F?
No. The FWX-15A14F is a semiconductor-class fuse with a high-speed element engineered to limit let-through energy and clear faster than a general-purpose fuse, which is what protects diodes, SCRs and thyristors in power conversion equipment. A general-purpose fuse of the same voltage will not clear fast enough to save the semiconductor. If you need an alternate brand, use another semiconductor-class device such as the Littelfuse L25S series, also rated 250V.
10) Where in a panel does a fuse like the FWX-15A14F typically go?
It is used where sensitive power semiconductors need protecting: rectifier circuits, SCR and diode legs, variable frequency drives, industrial motor drive systems and control panels. In practice an MRO or controls buyer stocks it as the replacement for the semiconductor protection fuses already in the drive or converter, not as the panel's main overcurrent device.
11) Is there a spec sheet for the Bussmann FWX-15A14F with the time-current data?
Yes, Eaton publishes a spec sheet for the FWX family covering the detailed electrical characteristics, and it is linked on the product record. Use it when you need the time-current curve and I2t values to coordinate the fuse with the semiconductor you are protecting.
How fast can I get the Bussmann FWX-15A14F 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 FWX-15A14F come with a warranty?
Absolutely. The Bussmann FWX-15A14F 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 FWX-15A14F?
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
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