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Littelfuse 0438.375WR | 0.375A 0603 very fast-acting ceramic chip fuse
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pLittelfuse 0438.375WR — 0.375 A, 63 V, fast-acting SMD fuse, 50 A @ 63 VDC / 32 VAC interrupting./p
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Littelfuse 0438.375WR | 0.375A 0603 very fast-acting ceramic chip fuse
Built by Littelfuse, the 0438.375WR carries 0.375 A, rated 63 VDC, uses a fast-acting element, in a ceramic body.
Technical Data
| Parameter | Rating |
|---|---|
| Parameter | Value |
| Manufacturer / Series | Littelfuse / 438 Series |
| Part number | 0438.375WR |
| Fuse characteristic | Fast-acting ceramic fuse |
| Rated current | 0.375 A |
| Maximum voltage rating | 63 VDC |
| Interrupting capability | 50 A @ 63 VDC / 32 VAC |
| Package | 0603 (approx. 1.6 × 0.8 mm) |
| Body / construction | Advanced ceramic |
| Operating temperature | -55 °C to +150 °C |
| Environmental / approvals | 100% lead-free, RoHS compliant and halogen-free; designed for leaded or lead-free reflow/wave soldering. |
| Product status | Active / verify current orderability |
Selection Notes
- Interrupting capability is 50 A @ 63 VDC / 32 VAC — 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 VDC; a lower-rated part is not a safe substitute.
- Do not upsize beyond 0.375 A to stop nuisance trips — fix the cause instead.
Typical Applications
Engineers usually specify it for these duties:
- battery
- EV
Part Number and Packing
Order code 0438.375WR from Littelfuse, supplied in 0603 (approx. 1.6 × 0.8 mm). Confirm the exact suffix before release.
Q&A
What are the ratings of the 0438.375WR?
0.375 A continuous at 63 VDC, interrupting rating 50 A @ 63 VDC / 32 VAC.
Is the 0438.375WR fast-acting or time-delay?
It is fast-acting. Expect it to open quickly on overload.
Can the 0438.375WR be used on a higher fault-current circuit?
No — its interrupting rating is 50 A @ 63 VDC / 32 VAC. Choose a part whose breaking capacity exceeds the prospective fault current.
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