0.5 Amp Fast Blow Fuse MDL-1-2

Name: 0.5 Amp Fast Blow Fuse MDL-1-2
Brand: Allied Innovations
SKU: MDL-1-2
Price: 1.13 USD
Availability: InStock

Part #: MDL-1-2

$1.13

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About this fuse

The Allied Innovations MDL-1-2 is a 0.5 amp fast blow fuse designed for IN.XE and Y-Series transformer control packs in hot tubs and spas. This OEM replacement fuse provides critical circuit protection by quickly interrupting power flow when electrical overloads occur, preventing damage to sensitive control system components. The fast blow design ensures rapid response to overcurrent conditions, making it ideal for protecting low-amperage circuits in spa control electronics.

At Bubbles Supply, this genuine Allied Innovations fuse comes with our exact fit guarantee, same-day shipping on in-stock orders, and comprehensive 1-year warranty for complete peace of mind. Our OEM-quality replacement ensures your spa's electrical protection meets original manufacturer specifications for reliable operation. Always verify your existing fuse amperage rating before replacement and ensure power is completely disconnected at the breaker before beginning any electrical work on your spa system.

Exact part number

MDL-1-2

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Also known as / Replaces

This part replaces or is interchangeable with:

0.5A fast blow fuse
1/2 amp fuse
MDL 1/2
MDL-0.5
MDL1/2

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

Technical specifications

Amperage: 0.5A

Common symptoms this part fixes

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

Spa control pack completely dead after electrical event
No power to display or topside panel
Transformer secondary circuit not responding
Control pack fails to initialize after a surge or short
Intermittent power loss to low-voltage control circuits

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

Before you buy — quick checklist

Confirm your existing fuse reads 0.5A — do not substitute a higher amperage rating
Verify your control pack is an Allied Innovations IN.XE or Y-Series transformer unit
Match the fuse type — this is a fast blow (F) MDL style, not a slow blow (T) fuse
Inspect the fuse holder and surrounding board for burn marks or damage before replacing
If the replacement fuse blows immediately, there is an underlying fault — do not keep replacing fuses without diagnosing the root cause

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.

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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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