Eaton 6125FA12A 12 A Fast-Blow Fuse, Ceramic, 6.3 x 2.5 mm
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Eaton 6125FA12A 12 A Fast-Blow Fuse, Ceramic, 6.3 x 2.5 mm
Technical Data
| Parameter | Rating |
|---|---|
| Part number | 6125FA12A |
| Ordering code | TR2/6125FA12A |
| Packaging | 5,000 pcs on 12 mm tape-and-reel, 13 in (330 mm) reel, EIA-481 |
| Typical cold resistance | 0.006 Ω |
| Rated current | 12 A |
| Design standard | EIA/IS-722 |
| Package | 6.3 x 2.5 mm (2410 imperial / 6125 metric) |
| Terminations | nickel/silver plated end terminations, solder immersion compatible |
| Agency approval | CSA component acceptance 053787 C 000, Class 1422-30; UL Recognition Guide JDYX2, File E19180 |
| Voltage rating | 125 Vac / 86 Vdc |
| Typical melting I2t | 69 A²s |
| Interrupting rating | 50 A at 125 Vac; 10,000 A at 86 Vdc |
| Typical voltage drop | 0.103 V |
Practical Notes
- Interrupting capability is 50 A at 125 Vac; 10,000 A at 86 Vdc — 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.
- Footprint 3 x 2.5 mm — check clip or holder compatibility before substitution.
- Working voltage must stay at or below 125 Vac / 86 Vdc; a lower-rated part is not a safe substitute.
- Do not upsize beyond 12 A to stop nuisance trips — fix the cause instead.
Application Scenarios
Common installation contexts include:
- EV
- surge
Buying Notes
Order code 6125FA12A from Eaton, supplied in 6.3 x 2.5 mm (2410 imperial / 6125 metric). Confirm the exact suffix before release.
Questions and Answers
What are the ratings of the 6125FA12A?
12 A continuous at 125 Vac / 86 Vdc, interrupting rating 50 A at 125 Vac; 10,000 A at 86 Vdc.
Is the 6125FA12A fast-acting or time-delay?
It is fast-acting. Expect it to open quickly on overload.
What size is the 6125FA12A?
It measures 3 x 2.5 mm. Match the holder or clip to this footprint.
Can the 6125FA12A be used on a higher fault-current circuit?
No — its interrupting rating is 50 A at 125 Vac; 10,000 A at 86 Vdc. Choose a part whose breaking capacity exceeds the prospective fault current.
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