Does this fit the old 120-1123C

Hi, I cannot remember exactly which old model I had, but there is a new base / mounting plate supplied in the box and a new different connector. If your old one is not too old, the old base plate and connector may be compatible. Either way it is not a difficult job and everything is provided.

Would this be suitable for the Firex 120-1123c?

I'm afraid I don't know the different model types. If your old one is mains powered, and possibly linked to a second alarm, it should be okay. A new mounting plate and connector is supplied with the new device, (in the Box).

Hi, i have the kidde firex model 4870 hardwired in my house and i need to replace them. do these alarms have the same wiring connection as the 4870?

You may need to change the connector that attaches to the mains power supply and connects to the alarm which is supplied in the box.

Is this suitable for mounting near a bathroom (approx 3m from shower, but mounted on landing ceiling) or do I need an ionisation alarm

Yes this best for mounting near a bathroom, as this is an optical alarm, it will reduce the amount of nuisance alarms as opposed to an ionisation alarm.

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Replacement for Kidde KF10 Mains Powered Smoke Alarms

Replacement for Kidde KF10 Mains Powered Smoke Alarms

Product ID: 388701532

Details

Brand
Kidde
Style
Classic
Power source
Mains Powered
Colour
White
Alarm
Visual
Sensor type
Ionization

⚡230V mains powered

🔋9V alkaline battery backup

🛠️Easy interlink with older models

A$71

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Description

🔥 Upgrade your home safety game with Kidde KF20 – power, peace, and protection in one! ⚡

LEGISLATION READY - Compliant with 2022 Scottish fire alarm laws and certified to BS EN 14604: 2005 standards.
SMART SILENCE MODE - Silence low battery chirps for 8 hours—enjoy peaceful nights without compromising safety.
RELIABLE DUAL POWER - Stay protected day and night with mains power plus 9V battery backup for uninterrupted safety.
SEAMLESS COMPATIBILITY - Direct replacement for multiple Kidde models, ensuring hassle-free upgrades without rewiring.
ALL INCLUSIVE INSTALLATION - Comes with fixings, dust cover for decorating, and a 6-year warranty—security made simple.

The Kidde KF20 is a mains-powered smoke alarm with a 9V alkaline battery backup, designed as a direct replacement for multiple older Kidde models. It features an LED indicator, combined test/hush button, low battery silence mode, and complies with updated 2022 Scottish fire safety legislation. Supplied with installation fixings and backed by a 6-year warranty, it offers reliable, code-compliant fire protection for modern homes.

Specifications

Alarm	Visual
Asin	B09N7BFW6P
Best Sellers Rank	2,967 in DIY & Tools (See Top 100 in DIY & Tools) 19 in Smoke Alarms
Brand	Kidde
Colour	White
Country Of Origin	China
Customer Reviews	4.7 4.7 out of 5 stars (392) 4.7 out of 5 stars
Included Components	9V back-up battery, Kidde KF20 mains-powered optical smoke alarm, Product manual, Screws and rawl plugs for secure fixing to ceiling
Item Type Name	Mains Powered Optical Smoke Alarm
Manufacturer	Kidde
Manufacturer Warranty Description	6 year warranty.
Model Number	KEKF10-RA
Number Of Items	1
Operating Humidity	Natural
Power Source	Mains Powered with Battery Backup
Product Style	Classic
Sensor Type	Ionization
Unit Count	1.0 count

Reviews

User

Very good for the money it's a lifesaver...

It was great, a like for like swap with one I installed 6 years ago, the one I bought was the updated version and was a straight swap with the same wiring connections although I didn't need to swap the back plate I still did as the old one was yellowing and would off looked odd. It also comes with a Duracell battery so a good quality.

22.01.2026

User

Excellent purchese

Good value easy to fit

11.06.2026

User

Good quality

Straight swap easy to install loud noise

18.07.2026

User

Good quality

Yes this worked!

19.07.2026

User

Easy to fit

Straight forward to fit came with Duracell battery very loud alarm when I tested it.

1.01.2026

User

Fitted perfectly delivered so fast

Excellent replacement for our smoke alarm fitted perfectly

11.06.2026

User

Fire safe

Easy to install. The installation instuctoojare clear to understand and my house safe once again.I will purchase again.

16.03.2026

User

Smoke detector replacement

Exactly what I ordered, and so fast free delivery, Perfect and will order against from Amazon *****

28.06.2026

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Rajesh P.

Customer service was outstanding when I had questions about the product.

2 days ago

Anjali K.

The product quality is outstanding. Exactly what I needed for my work.

1 month ago

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A$71

Duties & taxes included

In stock

Sold byAmazon AustraliaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Australia.

Secure transaction

ProDesertcart PRO

Fast, free shipping, member pricing & priority support.

Join PRO →

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Neha S.

Excellent communication throughout the order process. Product is perfect.

2 weeks ago

Yusuf A.

Fantastic experience overall. Will recommend to friends and family.

1 month ago

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