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Eaton S520-V-20-R 20 A 420 Vac Fast-Acting Axial Lead Ceramic Tube Fuse
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pEaton S520-V-20-R — 20 A, 420 V, fast-acting ceramic cartridge fuse, 300 A interrupting./p
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Eaton S520-V-20-R 20 A 420 Vac Fast-Acting Axial Lead Ceramic Tube Fuse
The S520-V-20-R from Eaton 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-V-20-R (TR2- = 1,500 pcs on reel) |
| Lead diameter (dim A) | 1.2 mm tinned copper |
| Typical voltage drop | 205 mV at rated current |
| Typical DC cold resistance | 5 mOhm |
| Typical melting I2t | 420 A2s at 10 In |
| Body | 5 x 20 mm ceramic tube, nickel/silver plated brass ends |
| Lead spacing (dim B) | 38.1 mm +/- 0.38 (BK-) / 15.8 mm +/- 2.0 (TR2-) |
| Interrupting rating at 420 Vac | 300 A |
| Interrupting rating at 250 Vac | 1500 A |
| Agency | UR E19180 (JDYX2); TUV T 50484820 02 |
| Rated voltage | 420 Vac |
| Current rating | 20 A A |
Practical Notes
- Interrupting capability is 300 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.
Application Scenarios
Common installation contexts include:
- transformer
Questions and Answers
What are the ratings of the S520-V-20-R?
20 A continuous at 420 Vac, interrupting rating 300 A.
Is the S520-V-20-R fast-acting or time-delay?
It is fast-acting. Expect it to open quickly on overload.
Can the S520-V-20-R be used on a higher fault-current circuit?
No — its interrupting rating is 300 A. Choose a part whose breaking capacity exceeds the prospective fault current.
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