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Bussmann FWH-300B 500V AC 300A FWH Series Fuse
Eaton Bussmann

Bussmann FWH-300B 500V AC 300A FWH Series Fuse

Part Number: FWH-300B

● LT: 8-12w

500V AC 300A FWH Series fuse, 100,000 A²s clearing I²t.

Rated Current300A
Rated Voltage500V AC/DC
Breaking Capacity200kA RMS Sym.
PackageNorth American Cylindrical Style
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aR fast acting (f) fuse 300A 500V AC, FWH Series (500V AC High-Speed). DC common bus, Power converters, Industrial drives, UPS systems. Low I²t 100,000 A²s, low watt loss 25.0W. UL Recognized, CE, IEC 60269-4 compliant.

Quick answer, specifications & FAQ
Direct answer

Eaton Bussmann High-Speed Fuse FWH-300B is rated 300A, 500V AC/DC, Fast Acting, North American Cylindrical Style. Breaking capacity 200kA RMS Sym., I²t 100.0k A²s, operating temperature -40°C to +125°C, certifications UL Recognized|CE|IEC 60269-4. Listed applications: DC Bus Protection, Motor Drives, Power conversion, UPS systems. Standards: IEC 60269-4. 500V AC 300A FWH Series fuse, 100,000 A²s clearing I²t.

Last updated 22 days ago

Key specifications

  • Part number: FWH-300B
  • Brand: Eaton Bussmann
  • Rated current: 300A
  • Rated voltage: 500V AC/DC
  • Breaking capacity: 200kA RMS Sym.
  • Fuse speed: Fast Acting
  • Package size: North American Cylindrical Style
  • Dimensions: North American Style
  • Terminal type: Bolted tag
  • Operating temperature: -40°C to +125°C
  • Certifications: UL Recognized|CE|IEC 60269-4
  • Standards: IEC 60269-4

Frequently asked questions

What are the current and voltage ratings of FWH-300B?

FWH-300B is rated 300A at 500V AC/DC.

What is the breaking capacity of FWH-300B?

FWH-300B has a breaking capacity of 200kA RMS Sym.. Confirm this covers the available fault current at the installation point.

What package size does FWH-300B use?

FWH-300B uses North American Cylindrical Style package size.

Which standards and approvals apply to FWH-300B?

FWH-300B is listed under IEC 60269-4 / UL Recognized|CE|IEC 60269-4.

What is FWH-300B used for?

FWH-300B is listed for DC Bus Protection, Motor Drives, Power conversion, UPS systems applications. Verify suitability for your circuit before ordering.

What are the ordering terms for FWH-300B?

FWH-300B: typical lead time 12-16 weeks, minimum order 10 pcs. Submit a quote request for a firm quotation.

Data sources

Part number
FWH-300B
Brand
Eaton Bussmann
Last updated
2026-10-10
Canonical URL
https://fusestock.com/products/eaton-bussmann-fwh-300b/

Technical Specifications

Part Number
FWH-300B
Manufacturer Part Number
FWH-300B
Series
FWH Series (500V AC High-Speed)
Fuse Type
High-Speed Fuse
Current Rating
300A
Voltage Rating
500V AC/DC
AC / DC
AC/DC
Breaking Capacity
200kA RMS Sym.
I²t
100.0k A²s
Pre-arcing I²t
13,500 A²s
Total I²t
100000
Operating Temperature
-40°C to +125°C
Package / Dimensions
North American Cylindrical Style
Mounting
Stud Mount
Application
DC Bus Protection · Motor Drives · Power conversion · UPS systems
Standard
IEC 60269-4
Terminal Type
Bolted tag
Fuse Speed
Fast Acting
Utilization Class
aR
Approvals
CE · CSA Approval (Unspecified) · RoHS · UL Recognized
Certifications
UL Recognized|CE|IEC 60269-4
Reference Lead Time
12-16 weeks
Minimum Order
10 pcs
Sample Status
Contact for Availability
Clearing I²t
100,000 A²s
Watt Loss @ In
25.0W

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