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Bussmann MDQ Series Small-Dimension Time-Delay Fuse, 250V
Model: BUSS-P474411
Bussmann MDQ Series Small-Dimension Time-Delay Fuse, 250VThe Bussmann MDQ Series time-delay fuse from the Eaton Bussmann series is rated 250V for dependable overcurrent protection on electrical...
Bussmann
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$14.54
Bussmann MDQ-3 Time-Delay Fuse, 250V Small Dimension
The Bussmann MDQ-3 Time-Delay Fuse is manufactured as part of the Eaton Bussmann series and is designed to protect wiring, components, and connected equipment from damaging overcurrent conditions. This fuse carries a 250V rating and uses a time-delay (TD) design, allowing it to ride through brief inrush currents and momentary overloads — such as those seen at motor start-up, transformer energization, or capacitor switching — without opening unnecessarily, while still responding to sustained overcurrent or short-circuit conditions. Built in a small-dimension (SM DIM) form factor, the MDQ-3 is sized to fit compact fuse holders, fuse blocks, and equipment where board space is at a premium, making it a practical, code-appropriate replacement fuse for 250V time-delay applications.
Key Features
- Series & Model: Manufactured as part of the Eaton Bussmann MDQ series under model number MDQ-3, providing a recognizable, traceable part number for replacement and reordering.
- Voltage Rating: Rated for 250V circuits, matching the voltage class commonly found in control panels, small transformers, and general-purpose equipment.
- Time-Delay (TD) Operation: The time-delay element is engineered to tolerate temporary current surges, such as motor inrush or transformer magnetizing current, reducing nuisance fuse blowing compared to fast-acting fuse types.
- Small Dimension (SM DIM) Body: A compact, small-dimension body allows the MDQ-3 to be used in space-limited fuse holders and equipment enclosures where a standard-size fuse will not fit.
- Reliable Overcurrent Protection: Designed to open and interrupt the circuit when sustained overcurrent conditions occur, helping protect downstream wiring and connected equipment from damage.
Technical Specifications
- Refer to manufacturer documentation for complete technical specifications.
Typical Applications
- Control Circuit and Small Transformer Protection
- General-Purpose Equipment Overcurrent Protection
- Commercial and Industrial Electrical Panels
- Fuse Holders and Fuse Blocks with Limited Mounting Space
- Fuse Replacement in Existing 250V Installations
Why Bussmann?
Eaton Bussmann is a recognized manufacturer of circuit protection products, and the MDQ series time-delay fuse reflects that engineering focus on dependable overcurrent protection. Choosing the Bussmann MDQ-3 for your 250V time-delay application helps ensure consistent, code-compliant circuit protection for professional and industrial electrical work.
Manufacturer Resources
Spec Sheet
Product Specs
- list_batch:
- BUSS-20260919
- Product Type:
- Time-Delay Fuse
- Voltage Rating:
- 250V
- Series:
- MDQ
- Configuration:
- Small Dimension
- Department:
- Electrical
- Product Subgroup:
- Fuses
- Product Group:
- Circuit Protection
- Product Height:
- 1.25 in
- Product Width:
- 0.25 in
- Product Length:
- 1.25 in
- Amperage Rating:
- 3A
Bussmann MDQ-3 – Frequently Asked Questions
1) Is the Bussmann MDQ-3 a time-delay fuse or fast-acting?
The MDQ-3 is a time-delay fuse. It rides through brief inrush and momentary overloads, motor start-up, transformer energization, capacitor switching, without opening, but still clears sustained overcurrent and short circuits. If you are getting nuisance blows from a fast-acting fuse in a control circuit, the time-delay element is what fixes that. If your circuit needs fast clearing to protect semiconductors, a time-delay fuse is the wrong choice.
2) What voltage is the Bussmann MDQ-3 rated for?
250V. That matches the voltage class used in control panels, small transformers, and general-purpose equipment. A fuse may be applied at or below its voltage rating, never above, so the MDQ-3 is not suitable for a 480V or 600V circuit.
3) Will the MDQ-3 fit a standard fuse holder, or does it need a small-dimension holder?
The MDQ-3 is built in the small-dimension (SM DIM) body, sized for compact fuse holders, fuse blocks, and equipment where board space is tight. It is not a standard-size body, so it needs a holder or block built for the small-dimension format. If your existing clips take a standard-size fuse, this one will not seat properly.
4) I'm replacing a blown fuse in an existing 250V panel. How do I confirm the MDQ-3 is the right one?
Match three things against the fuse you pulled: the MDQ series designation, the small-dimension body, and the 250V rating. The part number to order is MDQ-3, which is the traceable Eaton Bussmann designation for reordering. If the old fuse reads MDQ with a different number after it, that number is the amp rating and you need the matching one, not the -3.
5) Can I use the Bussmann MDQ-3 for control circuit and small transformer protection?
Yes, that is one of its stated applications, along with general-purpose equipment overcurrent protection and commercial and industrial electrical panels. Transformer magnetizing current on energization is exactly the kind of brief surge the time-delay element tolerates, so the fuse holds instead of blowing on every switch-on.
6) Where do I find the full technical data for the Bussmann MDQ series fuse?
Eaton publishes a spec sheet for the MDQ series, linked from the product record, and that is the document to use for the complete electrical characteristics, time-current curves, and dimensional detail. The catalog values you order from are the series (MDQ), the model (MDQ-3), the 250V rating, and the small-dimension body.
How fast can I get the Bussmann MDQ-3 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the
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Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit,
reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Bussmann MDQ-3 come with a warranty?
Absolutely. The Bussmann MDQ-3 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Bussmann MDQ-3?
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