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Eaton S520-V-12-5-R 12.5 A 420 Vac Fast-Acting Axial Lead Ceramic Tube Fuse
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pEaton S520-V-12-5-R — 12.5 A, 420 V, fast-acting ceramic cartridge fuse, 1500 A interrupting./p
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Eaton S520-V-12-5-R 12.5 A 420 Vac Fast-Acting Axial Lead Ceramic Tube Fuse
Built by Eaton, the S520-V-12-5-R carries 12.5 A, rated 420 Vac, uses a fast-acting element, in a ceramic body.
Technical Data
| Parameter | Rating |
|---|---|
| Parameter | Value |
| Orderable part number | S520-V-12-5-R (TR2- = 1,500 pcs on reel) |
| Voltage rating | 420 Vac |
| Interrupting rating at 250 Vac | 1500 A |
| Rated current | 12.5 A A |
| Lead diameter (dim A) | 1.0 mm tinned copper |
| Agency | UR E19180 (JDYX2); TUV T 50484820 02 |
| Typical DC cold resistance | 8.1 mOhm |
| Typical melting I2t | 160 A2s at 10 In |
| Interrupting rating at 420 Vac | 300 A |
| Body / package | 5 x 20 mm ceramic tube, nickel/silver plated brass ends |
| Typical voltage drop | 180 mV at rated current |
| Lead spacing (dim B) | 38.1 mm +/- 0.38 (BK-) / 15.8 mm +/- 2.0 (TR2-) |
Selection Notes
- Interrupting capability is 1500 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 420 Vac; a lower-rated part is not a safe substitute.
- Do not upsize beyond 12.5 A to stop nuisance trips — fix the cause instead.
Typical Applications
Engineers usually specify it for these duties:
- EV
- transformer
Part Number and Packing
Order code S520-V-12-5-R from Eaton, supplied in 5 x 20 mm ceramic tube, nickel/silver plated brass ends. Confirm the exact suffix before release.
Q&A
What are the ratings of the S520-V-12-5-R?
12.5 A continuous at 420 Vac, interrupting rating 1500 A.
Is the S520-V-12-5-R fast-acting or time-delay?
It is fast-acting. Expect it to open quickly on overload.
Can the S520-V-12-5-R be used on a higher fault-current circuit?
No — its interrupting rating is 1500 A. Choose a part whose breaking capacity exceeds the prospective fault current.
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