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Eaton MDQ-9 Dual-Element Delay Fuse 9 A 32 Vac - 1/4 x 1-1/4 in
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pEaton MDQ-9 — 9 A, 32 V, time-delay fuse, 1,000 A at 32 Vac interrupting./p
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Eaton MDQ-9 Dual-Element Delay Fuse 9 A 32 Vac - 1/4 x 1-1/4 in
The MDQ-9 from Eaton carries 9 A, rated 32 Vac, uses a time-delay element.
Technical Data
| Parameter | Rating |
|---|---|
| Part number | MDQ-9 |
| AC interrupting rating | 1,000 A at 32 Vac |
| End caps | nickel-plated brass |
| Design standard | UL 248-14 |
| Voltage rating | 32 Vac |
| Breaking capacity | 35 A at 250 Vac up to 1 A, 100 A to 7 A, 1,000 A at 32 V above |
| Rated current | 9 A |
| Element | dual element |
| Body | Glass tube, 1/4 x 1-1/4 in (6.3 x 32 mm) |
| Typical DC cold resistance | 0.00888 Ω |
Practical Notes
- Interrupting capability is 1,000 A at 32 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.
- Working voltage must stay at or below 32 Vac; a lower-rated part is not a safe substitute.
- Do not upsize beyond 9 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 MDQ-9?
9 A continuous at 32 Vac, interrupting rating 1,000 A at 32 Vac.
Is the MDQ-9 fast-acting or time-delay?
It is time-delay. It tolerates short inrush surges.
Can the MDQ-9 be used on a higher fault-current circuit?
No — its interrupting rating is 1,000 A at 32 Vac. Choose a part whose breaking capacity exceeds the prospective fault current.
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