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Eaton S520-20-R 20 A 420 Vac Fast-Acting Ceramic Tube Fuse
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pEaton S520-20-R — 20 A, 420 V, fast-acting ceramic cartridge fuse, 1500 A interrupting./p
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Eaton S520-20-R 20 A 420 Vac Fast-Acting Ceramic Tube Fuse
Built by Eaton, the S520-20-R carries 20 A, rated 420 Vac, uses a fast-acting element, in a ceramic body.
Technical Data
| Parameter | Rating |
|---|---|
| Parameter | Value |
| Orderable part number | S520-20-R (BK- = 100 pcs carton, BK1- = 1,000 pcs polybag; S520-V-20-R for axial leads) |
| Interrupting rating at 250 Vac | 1500 A |
| Typical melting I2t | 420 A2s (measured at 10 In) |
| Construction | 5 x 20 mm ceramic tube, nickel/silver plated brass ends |
| Dissipated power at rating | 4.10 W |
| Typical DC cold resistance | 5 mOhm |
| Operating temperature | -55 C to +125 C with derating |
| Typical voltage drop | 205 mV at rated current |
| Interrupting rating at 420 Vac | 300 A |
| Voltage rating | 420 Vac |
| Current rating | 20 A |
| Agency | UR E19180 (JDYX2); TUV T 50484820 02 |
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 20 A to stop nuisance trips — fix the cause instead.
Typical Applications
Engineers usually specify it for these duties:
- PFC
- surge
Q&A
What are the ratings of the S520-20-R?
20 A continuous at 420 Vac, interrupting rating 1500 A.
Is the S520-20-R fast-acting or time-delay?
It is fast-acting. Expect it to open quickly on overload.
Can the S520-20-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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