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Bussmann MDB-12 250V AC 12A MDB Series Fuse
Eaton Bussmann

Bussmann MDB-12 250V AC 12A MDB Series Fuse

Part Number: MDB-12

● LT: 8-12w

250V AC 12A MDB Series fuse, clearing I²t

Rated Current12A
Rated Voltage250V AC
Breaking Capacity100A @ 250V AC / 10000A @ 125V AC
Package1/4" x 1-1/4" (6.3×32mm) Ceramic
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Supplemental (UL 248-14) time-delay (td) fuse 12A 250V, 1/4″ x 1-1/4″ (6.3x32mm) Ceramic. Designed for battery chargers, power supplies, motor protection. 3.0W power loss. UL 248-14, CSA

Quick answer, specifications & FAQ
Direct answer

Eaton Bussmann Supplemental Fuse MDB-12 is rated 12A, 250V AC, Time Delay, 1/4" x 1-1/4" (6.3×32mm) Ceramic. Breaking capacity 100A @ 250V AC / 10000A @ 125V AC, I²t N/A (Supplemental), operating temperature -40°C to +125°C, certifications UL Recognized|CE. Listed applications: Battery chargers, Motor protection, Power supplies. Standards: CSA C22.2 No. 248.14, UL 248-14. 250V AC 12A MDB Series fuse, clearing I²t

Last updated 22 days ago

Key specifications

  • Part number: MDB-12
  • Brand: Eaton Bussmann
  • Rated current: 12A
  • Rated voltage: 250V AC
  • Breaking capacity: 100A @ 250V AC / 10000A @ 125V AC
  • Fuse speed: Time Delay
  • Package size: 1/4" x 1-1/4" (6.3×32mm) Ceramic
  • Dimensions: 1/4" x 1-1/4" (6.3×32mm) Ceramic
  • Terminal type: Ferrule
  • Operating temperature: -40°C to +125°C
  • Certifications: UL Recognized|CE
  • Standards: CSA C22.2 No. 248.14, UL 248-14

Frequently asked questions

What are the current and voltage ratings of MDB-12?

MDB-12 is rated 12A at 250V AC.

What is the breaking capacity of MDB-12?

MDB-12 has a breaking capacity of 100A @ 250V AC / 10000A @ 125V AC. Confirm this covers the available fault current at the installation point.

What package size does MDB-12 use?

MDB-12 uses 1/4" x 1-1/4" (6.3×32mm) Ceramic package size.

Which standards and approvals apply to MDB-12?

MDB-12 is listed under CSA C22.2 No. 248.14, UL 248-14 / UL Recognized|CE.

What is MDB-12 used for?

MDB-12 is listed for Battery chargers, Motor protection, Power supplies applications. Verify suitability for your circuit before ordering.

What are the ordering terms for MDB-12?

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

Data sources

Part number
MDB-12
Brand
Eaton Bussmann
Last updated
2026-10-10
Canonical URL
https://fusestock.com/products/eaton-bussmann-mdb-12/

Technical Specifications

Part Number
MDB-12
Manufacturer Part Number
MDB-12
Series
MDB Series (1/4"x1-1/4" Dual-Element Time-Delay Ceramic)
Fuse Type
Supplemental Fuse
Current Rating
12A
Voltage Rating
250V AC
AC / DC
AC
Breaking Capacity
100A @ 250V AC / 10000A @ 125V AC
I²t
N/A (Supplemental)
Operating Temperature
-40°C to +125°C
Package / Dimensions
1/4" x 1-1/4" (6.3×32mm) Ceramic
Mounting
Fuse Holder
Application
Battery chargers · Motor protection · Power supplies
Standard
CSA C22.2 No. 248.14 · UL 248-14
Terminal Type
Ferrule
Fuse Speed
Time Delay
Utilization Class
Supplemental
Approvals
CE · UL Recognized
Certifications
UL Recognized|CE
Reference Lead Time
12-16 weeks
Minimum Order
10 pcs
Sample Status
Contact for Availability
Pre-arcing I²t
Clearing I²t: Watt Loss @ In: 3.0W
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