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Eaton Bussmann FWS-12A20FI 12A 1400V AC / 1000V DC Class gG 20x127mm High-Speed Ferrule Fuse with Indicator
Eaton Bussmann

Eaton Bussmann FWS-12A20FI 12A 1400V AC / 1000V DC Class gG 20x127mm High-Speed Ferrule Fuse with Indicator

Part Number: FWS-12A20FI

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FWS-12A20FI: 12A; 1400V AC / 1000V DC; Class gG; High-Speed; 50kA AC.

Rated Current12A
Rated Voltage1400V AC / 1000V DC
Breaking Capacity50kA AC
Package20 × 127 mm
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Eaton Bussmann FWS-12A20FI is a 20x127mm high-speed ferrule fuse with indicator rated 12A at 1400V AC / 1000V DC. Interrupting/withstand rating: 50kA AC. Typical applications: DC common bus, DC drives, Power converters, Rectifiers, Rail traction auxiliary circuits. Catalog prints 1000Vdc rating, but DC interrupting rating is stated only through 10A. Source: Bussmann Full Line Catalog 1007 (2018), page 4-35.

Quick answer, specifications & FAQ
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Eaton Bussmann High-Speed Ferrule Fuse FWS-12A20FI is rated 12A, 1400V AC / 1000V DC, High Speed, 20 × 127 mm. Breaking capacity 50kA AC, I²t Pre-arcing 170 A²s; clearing 380 A²s, certifications IEC 60077|CE. Listed applications: DC Bus Protection, Motor Drives, Power conversion, Rail traction auxiliary circuits. Standards: IEC, IEC 60077. FWS-12A20FI: 12A; 1400V AC / 1000V DC; Class gG; High-Speed; 50kA AC.

Last updated 44 days ago

Key specifications

  • Part number: FWS-12A20FI
  • Brand: Eaton Bussmann
  • Rated current: 12A
  • Rated voltage: 1400V AC / 1000V DC
  • Breaking capacity: 50kA AC
  • Fuse speed: High Speed
  • Package size: 20 × 127 mm
  • Terminal type: Ferrule + Indicator
  • Certifications: IEC 60077|CE
  • Standards: IEC, IEC 60077
  • Typical lead time: 12-16 weeks
  • Catalog prints 1000Vdc rating, but DC interrupting rating is stated only through 10A.; Source: Bussmann Full Line Catalog 1007 (2018), page 4-35. Catalog watts loss at rated current: 3.4 W.

Frequently asked questions

What are the current and voltage ratings of FWS-12A20FI?

FWS-12A20FI is rated 12A at 1400V AC / 1000V DC.

What is the breaking capacity of FWS-12A20FI?

FWS-12A20FI has a breaking capacity of 50kA AC. Confirm this covers the available fault current at the installation point.

What package size does FWS-12A20FI use?

FWS-12A20FI uses 20 × 127 mm package size.

Which standards and approvals apply to FWS-12A20FI?

FWS-12A20FI is listed under IEC, IEC 60077 / IEC 60077|CE.

What is FWS-12A20FI used for?

FWS-12A20FI is listed for DC Bus Protection, Motor Drives, Power conversion, Rail traction auxiliary circuits applications. Verify suitability for your circuit before ordering.

What are the ordering terms for FWS-12A20FI?

FWS-12A20FI: typical lead time 12-16 weeks. Submit a quote request for a firm quotation.

Data sources

Part number
FWS-12A20FI
Brand
Eaton Bussmann
Last updated
2026-09-19
Canonical URL
https://fusestock.com/products/eaton-bussmann-fws-12a20fi/

Technical Specifications

Part Number
FWS-12A20FI
Manufacturer Part Number
FWS-12A20FI
Series
FWS Series (20x127mm High-Speed Ferrule)
Fuse Type
High-Speed Ferrule Fuse
Current Rating
12A
Voltage Rating
1400V AC / 1000V DC
AC / DC
AC/DC
Breaking Capacity
50kA AC
I²t
Pre-arcing 170 A²s; clearing 380 A²s
Pre-arcing I²t
170
Total I²t
380
Package / Dimensions
20 × 127 mm
Mounting
Fuse Holder
Application
DC Bus Protection · Motor Drives · Power conversion · Rail traction auxiliary circuits · Rectifiers
Standard
IEC · IEC 60077
Terminal Type
Ferrule + Indicator
Fuse Speed
High Speed
Utilization Class
gG
Approvals
CE
Certifications
IEC 60077|CE
Reference Lead Time
12-16 weeks
Catalog prints 1000Vdc rating, but DC interrupting rating is stated only through 10A.; Source
Bussmann Full Line Catalog 1007 (2018), page 4-35. Catalog watts loss at rated current: 3.4 W.

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