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Eaton GBB-1-1/4-R 1.25 A 250 Vac Very Fast-Acting Ceramic Tube Fuse
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pEaton GBB-1-1/4-R — 1.25 A, 250 V, fast-acting ceramic cartridge fuse, 200 A interrupting./p
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Eaton GBB-1-1/4-R 1.25 A 250 Vac Very Fast-Acting Ceramic Tube Fuse
The GBB-1-1/4-R from Eaton carries 1.25 A, rated 250 Vac / 125 Vdc, uses a fast-acting element, in a ceramic body.
Technical Data
| Parameter | Rating |
|---|---|
| Parameter | Value |
| Manufacturer / Series | Eaton / GBB Series |
| Orderable part number | GBB-1-1/4-R (packaging BK-GBB-1-1/4-R / BK1-GBB-1-1/4-R) |
| Current rating | 1.25 A |
| Voltage rating | 250 Vac / 125 Vdc |
| Interrupting rating @ 250 Vac | 200 A |
| Interrupting rating @ 125 Vac | 10,000 A |
| Interrupting rating @ 125 Vdc | 10,000 A |
| Typical DC cold resistance | 0.17900 Ohm |
| Typical voltage drop | 0.2497 V at rated current |
| Package | 1/4 x 1-1/4 in (6.3 x 32 mm) ceramic tube, nickel-plated brass end caps, optional axial leads |
| Option codes | B = board-washable sealed; V = axial leads |
| Agency | UL Recognized card JFHR2 file E56412 (1-30 A); CSA component accepted class 1422-30 file 53787 |
| Environmental | no RoHS or halogen-free claim is made on this datasheet |
Practical Notes
- Interrupting capability is 200 A — confirm the circuit's prospective fault current stays below this.
- Fast element suits resistive and semiconductor loads rather than motors with high inrush.
- Because it opens within milliseconds, downstream semiconductors see less let-through energy.
- Ceramic body holds higher breaking capacity than glass at the same footprint.
- It is the usual choice where prospective fault current is high.
- Working voltage must stay at or below 250 Vac / 125 Vdc; a lower-rated part is not a safe substitute.
- Do not upsize beyond 1.25 A to stop nuisance trips — fix the cause instead.
Application Scenarios
Common installation contexts include:
- adapter
- appliance
Buying Notes
Order code GBB-1-1/4-R from Eaton, supplied in 1/4 x 1-1/4 in (6.3 x 32 mm) ceramic tube, nickel-plated brass end caps, optional axial leads. Confirm the exact suffix before release.
Questions and Answers
What are the ratings of the GBB-1-1/4-R?
1.25 A continuous at 250 Vac / 125 Vdc, interrupting rating 200 A.
Is the GBB-1-1/4-R fast-acting or time-delay?
It is fast-acting. Expect it to open quickly on overload.
Can the GBB-1-1/4-R be used on a higher fault-current circuit?
No — its interrupting rating is 200 A. Choose a part whose breaking capacity exceeds the prospective fault current.
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