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Eaton MDA-3/4-R 750 mA Ceramic Tube Fuse, Time-Lag, 250 Vac
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pEaton MDA-3/4-R — 750 mA, 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-3/4-R 750 mA Ceramic Tube Fuse, Time-Lag, 250 Vac
Built by Eaton, the MDA-3/4-R carries 750 mA, rated 250 Vac, uses a time-delay element, in a ceramic body.
Technical Data
| Parameter | Rating |
|---|---|
| Part number | MDA-3/4-R |
| Element | single element |
| Voltage rating | 250 Vac |
| End caps | nickel-plated brass |
| Typical melting I2t | 0.42 A²s |
| Rated current | 750 mA (3/4 A) |
| Design standard | UL 248-14 |
| Maximum voltage drop | 495 mV |
| AC interrupting rating | 200 A at 250 Vac; 10,000 A at 125 Vac |
| Typical DC cold resistance | 520 mΩ |
| Body | Ceramic tube, 1/4 x 1-1/4 in (6.3 x 32 mm) |
Selection 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.
- Time-delay element rides through motor starting and capacitive inrush without nuisance opening.
- Startup surges of several times rated current are tolerated for a short window.
- 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 250 Vac; a lower-rated part is not a safe substitute.
- Do not upsize beyond 750 mA to stop nuisance trips — fix the cause instead.
Typical Applications
Engineers usually specify it for these duties:
- EV
Q&A
What are the ratings of the MDA-3/4-R?
750 mA continuous at 250 Vac, interrupting rating 200 A at 250 Vac; 10,000 A at 125 Vac.
Is the MDA-3/4-R fast-acting or time-delay?
It is time-delay. It tolerates short inrush surges.
Can the MDA-3/4-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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