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Eaton MDA-20-R 20 A Ceramic Tube Fuse, Slow-Blow, 250 Vac
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pEaton MDA-20-R — 20 A, 250 V, time-delay ceramic cartridge fuse, 200 A at 250 Vac; 10,000 A at 125 Vac interrupting./p
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Eaton MDA-20-R 20 A Ceramic Tube Fuse, Slow-Blow, 250 Vac
The MDA-20-R from Eaton carries 20 A, rated 125 Vdc, uses a slow-blow element, in a ceramic body.
Technical Data
| Parameter | Rating |
|---|---|
| Part number | MDA-20-R |
| Maximum voltage drop | 95 mV |
| Voltage rating, DC | 125 Vdc |
| Voltage rating | 250 Vac |
| Typical melting I2t | 483.5 A²s |
| AC interrupting rating | 200 A at 250 Vac; 10,000 A at 125 Vac |
| Body | Ceramic tube, 1/4 x 1-1/4 in (6.3 x 32 mm) |
| Typical DC cold resistance | 4.1 mΩ |
| Element | single element |
| End caps | nickel-plated brass |
| Design standard | UL 248-14 |
| Rated current | 20 A |
Practical Notes
- Interrupting capability is 200 A at 250 Vac; 10,000 A at 125 Vac — confirm the circuit's prospective fault current stays below this.
- 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 125 Vdc; 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:
- EV
- surge
Questions and Answers
What are the ratings of the MDA-20-R?
20 A continuous at 125 Vdc, interrupting rating 200 A at 250 Vac; 10,000 A at 125 Vac.
Is the MDA-20-R fast-acting or time-delay?
It is slow-blow. It tolerates short inrush surges.
Can the MDA-20-R be used on a higher fault-current circuit?
No — its interrupting rating is 200 A at 250 Vac; 10,000 A at 125 Vac. Choose a part whose breaking capacity exceeds the prospective fault current.
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