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Littelfuse 0438.750WR 0.75A 0603 Very Fast Ceramic Chip Fuse
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pLittelfuse 0438.750WR — 0.75 A, 63 V, SMD fuse, 50 A @ 63 VDC / 32 VAC interrupting./p
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Littelfuse 0438.750WR 0.75A 0603 Very Fast Ceramic Chip Fuse
Littelfuse 0438.750WR 0.75A 0603 Very Fast Ceramic Chip Fuse belongs to the Littelfuse range. It carries 0.75 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 | 0438.750WR |
| Fuse characteristic | Fast-acting ceramic fuse |
| Rated current | 0.75 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 |
Design 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 0.75 A to stop nuisance trips — fix the cause instead.
Where It Is Used
Typical places this fuse turns up:
- battery
- EV
Ordering Details
Order code 0438.750WR from Littelfuse, supplied in 0603 (approx. 1.6 × 0.8 mm). Confirm the exact suffix before release.
Common Questions
What are the ratings of the 0438.750WR?
0.75 A continuous at 63 VDC, interrupting rating 50 A @ 63 VDC / 32 VAC.
Is the 0438.750WR fast-acting or time-delay?
It is fast-acting. Expect it to open quickly on overload.
Can the 0438.750WR 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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