25 Amp Fuse MDA-25

Name: 25 Amp Fuse MDA-25
Brand: Allied Innovations
SKU: MDA-25
Price: 3.9 USD
Availability: InStock

Part #: MDA-25

$3.90

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About this fuse

The Allied Innovations MDA-25 is a 25-amp slow-blow ceramic fuse designed for spa and hot tub electrical systems requiring reliable overcurrent protection. This 250V AC rated fuse provides essential safety for spa control systems, pump motors, and heating elements in residential and commercial hot tubs. The slow-blow design prevents nuisance tripping from normal motor startup surges while delivering fast protection against dangerous fault conditions.

Built to exact OEM specifications, this ceramic fuse delivers the precise amperage rating your spa requires for safe operation. At Bubbles Supply, we guarantee an exact fit for your electrical panel, back it with our comprehensive 1-year warranty, and ship same-day to get your spa running again fast. Always verify the correct amperage rating on your existing fuse or consult your spa's electrical diagram before installation to ensure proper protection.

Exact part number

MDA-25

Save this for ordering or warranty claims

Also known as / Replaces

This part replaces or is interchangeable with:

25 amp ceramic fuse
25A slow-blow fuse
MDA 25
MDA25

Looking for an older part number? Check our supersession lookup tool

Technical specifications

Voltage: 250V AC
Amperage: 25A

Common symptoms this part fixes

If your spa is showing any of these signs, this part is likely your fix:

Spa completely dead with no power
Control panel shows no display after a fault
Pump or heater trips fuse repeatedly under load
Spa loses power intermittently during motor startup
Blown fuse found during routine inspection or service call

Not sure if this is your problem? Try our diagnostic centre or .

Before you buy — quick checklist

Pull the existing fuse and confirm it is rated MDA-25 (25A, 250V, slow-blow type) before ordering
Verify the physical fuse size matches your control box fuse holder — MDA series are standard 1-1/4 inch x 1/4 inch (32mm x 6.3mm) ceramic fuses
Do not upsize the fuse rating — installing a higher-amp fuse to stop nuisance tripping can damage your control board, pump, or heater
If you are replacing a blown fuse, diagnose the underlying fault first — a fuse that blows again immediately indicates a short or overload condition that must be resolved
Confirm your spa control system calls for a slow-blow (time-delay) fuse, not a fast-blow — substituting the wrong type will cause repeated nuisance trips or inadequate protection

Reading the checklist now prevents 90% of returns. Worth the 60 seconds.

Easy — DIY-friendlyTypically 5-15 minutes

Warranty

1 year manufacturer warranty against defects

Covers manufacturing defects. Does not cover improper installation, normal wear, or accidental damage.

Warranty claims: warranty@bubblessupply.com

Perfect Fit Guarantee

Ordered with our help and the part doesn't fit? Contact us before installation. We'll resolve it with an exchange, replacement recommendation, or return approval.

Learn about our Perfect Fit Guarantee →

Shipping

We ship across the US and Canada. US orders ship from our US warehouse to US customers; Canadian orders ship from our Canadian warehouse to Canadian customers — no cross-border shipping, no surprise duties. In-stock orders placed before 3pm CT ship same day. Standard shipping $9.95 flat rate. Free shipping on orders over $200. Express options available at checkout.

Returns

30-day hassle-free returns on unused parts in original packaging. Contact us before returning to receive your RMA number.

Frequently asked questions

Check the Compatibility section above to confirm fitment for your spa brand and model. If your model is not listed, use our fitment selector at /pages/find-my-part or ask our parts AI for a personalized recommendation.

In-stock orders placed before 3pm CT ship the same day. You will receive tracking information by email as soon as your order ships.

We accept returns within 30 days of delivery for unused items in original packaging. Email returns@bubblessupply.com with your order number to start a return. Installed electrical parts cannot be returned for safety reasons.

Yes, all new parts come with a 1-year warranty against manufacturing defects. Warranty does not cover damage from improper installation or normal wear and tear.

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AI Fitment Assistant

Tell us your spa model and we will confirm this part fits before you buy.