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MDL-1-1/4-R Eaton 1.25 A Time-Lag Glass Fuse 250 Vac
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pEaton MDL-1-1/4-R — 1.25 A, 250 V, time-delay glass cartridge fuse, 100 A at 250 Vac; 10,000 A at 125 Vac interrupting./p
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MDL-1-1/4-R Eaton 1.25 A Time-Lag Glass Fuse 250 Vac
The MDL-1-1/4-R from the maker carries 1.25 A, rated 250 Vac, uses a time-delay element, in a glass body.
Technical Data
| Parameter | Rating |
|---|---|
| Part number | MDL-1-1/4-R |
| Typical melting I2t | 86.2 A²s |
| End caps | nickel-plated brass |
| AC interrupting rating | 100 A at 250 Vac; 10,000 A at 125 Vac |
| Design standard | UL 248-14 |
| Typical DC cold resistance | 0.205 Ω |
| Typical voltage drop | 0.722 V |
| Body | Glass tube, 1/4 x 1-1/4 in (6.4 x 31.7 mm) |
| Voltage rating | 250 Vac |
| Rated current | 1.25 A (1-1/4 A) |
| Element | single element |
Practical Notes
- Interrupting capability is 100 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.
- Glass body lets you inspect the element after a fault.
- Best kept for lower fault-current circuits where visual diagnosis matters.
- Working voltage must stay at or below 250 Vac; a lower-rated part is not a safe substitute.
- Do not upsize beyond 1.25 A to stop nuisance trips — fix the cause instead.
Application Scenarios
Common installation contexts include:
- EV
Questions and Answers
What are the ratings of the MDL-1-1/4-R?
1.25 A continuous at 250 Vac, interrupting rating 100 A at 250 Vac; 10,000 A at 125 Vac.
Is the MDL-1-1/4-R fast-acting or time-delay?
It is time-delay. It tolerates short inrush surges.
Can the MDL-1-1/4-R be used on a higher fault-current circuit?
No — its interrupting rating is 100 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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