3 Amp Slo Blo Fuse 48K9778

Name: 3 Amp Slo Blo Fuse 48K9778
Brand: Allied Innovations
SKU: 48K9778
Price: 6.86 USD
Availability: InStock

Part #: 48K9778

$6.86

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1-year warrantySame-day ship before 3pm CTPerfect Fit Guarantee30-day returns

About this fuse

The Allied Innovations 3 Amp Slo Blo Fuse (48K9778) is a genuine OEM slow-blow electrical fuse designed for spa control systems and circuit boards. This MDL-type fuse provides reliable overcurrent protection for sensitive electronic components in hot tubs and spas, preventing damage from electrical surges while allowing normal startup current spikes to pass through safely.

Built to exact OEM specifications, this 3-amp slow-blow fuse ensures your spa's electrical systems operate safely and efficiently. At Bubbles Supply, we guarantee an exact fit with our genuine Allied Innovations replacement parts, backed by our 1-year warranty and same-day shipping on most orders. The slow-blow design makes it ideal for motor circuits and control boards that experience brief current surges during normal operation.

Always disconnect power before replacing any electrical components. Verify amperage rating matches your spa's requirements before installation to ensure proper circuit protection.

Exact part number

48K9778

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Also known as / Replaces

This part replaces or is interchangeable with:

3A slo-blo fuse
MDL 3 amp fuse
MDL-3 fuse
slow-blow fuse 3 amp

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

Technical specifications

Amperage: 3A

Common symptoms this part fixes

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

Spa control board has no power after surge or short
Spa completely dead with no display or response
Heater or pump circuit not responding after electrical event
Board fuse visibly blown or discolored
Spa trips breaker and fails to restart after reset

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

Before you buy — quick checklist

Confirm your board requires a 3A fuse — check the existing fuse body or board silkscreen label for amperage rating
Verify the fuse type is MDL (slow-blow) and not a fast-blow type — substituting fast-blow can cause nuisance failures
Inspect the board for any burn marks or damaged components — a blown fuse may be a symptom, not the root cause
Always diagnose why the fuse blew before replacing — repeated failures indicate a deeper wiring or component fault

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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