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Littelfuse 04371.25WR 1.25A 1206 Very Fast Ceramic Chip Fuse
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pLittelfuse 04371.25WR — 1.25 A, 63 V, SMD fuse, 50 A @ 63 V AC/DC interrupting./p
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Littelfuse 04371.25WR 1.25A 1206 Very Fast Ceramic Chip Fuse
Littelfuse 04371.25WR 1.25A 1206 Very Fast Ceramic Chip Fuse belongs to the Littelfuse range. It carries 1.25 A, rated 63 V, uses a fast-acting element, in a ceramic body.
Technical Data
| Parameter | Rating |
|---|---|
| Parameter | Value |
| Manufacturer / Series | Littelfuse / 437 Series |
| Part number | 04371.25WR |
| Fuse characteristic | Fast-acting ceramic fuse |
| Rated current | 1.25 A |
| Maximum voltage rating | 63 V |
| Interrupting capability | 50 A @ 63 V AC/DC |
| Package | 1206 (approx. 3.2 × 1.6 mm) |
| Body / construction | Advanced ceramic |
| Operating temperature | -55 °C to +150 °C |
| Environmental / approvals | 100% lead-free, halogen-free and RoHS compliant; UL/CSA recognition is listed across the series. |
| Product status | Active / verify current orderability |
Design Notes
- Interrupting capability is 50 A @ 63 V AC/DC — 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 63 V; a lower-rated part is not a safe substitute.
- Do not upsize beyond 1.25 A to stop nuisance trips — fix the cause instead.
Where It Is Used
Typical places this fuse turns up:
- server
Ordering Details
Order code 04371.25WR from Littelfuse, supplied in 1206 (approx. 3.2 × 1.6 mm). Confirm the exact suffix before release.
Common Questions
What are the ratings of the 04371.25WR?
1.25 A continuous at 63 V, interrupting rating 50 A @ 63 V AC/DC.
Is the 04371.25WR fast-acting or time-delay?
It is fast-acting. Expect it to open quickly on overload.
Can the 04371.25WR be used on a higher fault-current circuit?
No — its interrupting rating is 50 A @ 63 V AC/DC. Choose a part whose breaking capacity exceeds the prospective fault current.
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