Kasa Smart Dimmer KS225 (US): what it works with

TP-Link · model KS225 · For the US and Canada

• Matter Yes, over Wi-Fi
• Apple Home Via Matter
• Google Home Via Matter
• Amazon Alexa Via Matter
• SmartThings Via Matter
• Home Assistant Yes

The Kasa KS225 is a Matter-certified Wi-Fi dimmer for a US wall box with a neutral wire. TP-Link lists Apple Home, Alexa, Google Assistant and SmartThings, and Home Assistant supports it through the TP-Link integration. It dims 150 W of LED or 300 W of incandescent and halogen with TRIAC dimming.

Checked against 4 sources on Oct 25, 2026

Ecosystem compatibility

“Via Matter” means you add it with that platform's Matter controller instead of a brand skill or app. “Unconfirmed” means we couldn't find an official source either way. How we verify.

Specs that matter for setup

Radio

Wi-Fi, Bluetooth^[1],[3]

Hub required

No^[1]

Local control

Yes^[2],[4]

Form

Wall switch^[1]

Dimmer

Yes^[1],[2]

Needs neutral wire

Yes^[2]

Gangs / channels

Unconfirmed^[1]

• Radio: 2.4 GHz Wi-Fi only; TP-Link lists Bluetooth 4.2 for setup only.
• Hub: TP-Link says no hub is needed; it connects directly to 2.4 GHz Wi-Fi.
• Local control: Home Assistant's integration talks to the switch on the local network (local polling), though it needs TP-Link credentials. Kasa's page also mentions local control through Matter controllers.
• Form: Replaces a standard wall switch.
• Dimmer: TRIAC (leading edge) dimming; 300 W incandescent/halogen, 150 W LED.
• Needs neutral wire: Kasa's US product page says a neutral wire is required.
• Gangs / channels: TP-Link's and Kasa's pages don't mention 3-way support or gang count.

Before you buy

• 2.4 GHz Wi-Fi only; Bluetooth is for setup.
• Needs a neutral wire.
• LED loads are capped at 150 W.
• TP-Link does not state whether 3-way wiring works.
• Home Assistant's TP-Link integration needs TP-Link account credentials for this model.

Quick answers

Does the Kasa Smart Dimmer KS225 (US) work with Apple Home?

Yes, through Matter: add it with Apple Home's Matter pairing. TP-Link lists Apple Home as a supported platform next to its Matter certification. More smart switches for Apple Home

Does the Kasa Smart Dimmer KS225 (US) work with Google Home?

Yes, through Matter: add it with Google Home's Matter pairing. TP-Link lists Google Assistant as a supported platform alongside Matter. More smart switches for Google Home

Does the Kasa Smart Dimmer KS225 (US) work with Amazon Alexa?

Yes, through Matter: add it with Amazon Alexa's Matter pairing. TP-Link lists Alexa as a supported platform alongside Matter. More smart switches for Amazon Alexa

Does the Kasa Smart Dimmer KS225 (US) work with SmartThings?

Yes, through Matter: add it with SmartThings' Matter pairing. TP-Link lists Samsung SmartThings as a supported platform alongside Matter. More smart switches for SmartThings

Does the Kasa Smart Dimmer KS225 (US) work with Home Assistant?

Yes. The Kasa Smart Dimmer KS225 (US) works with Home Assistant directly. Home Assistant's TP-Link Smart Home integration lists the KS225; it needs TP-Link account credentials ("Model requires authentication"). Matter is also an option. More smart switches for Home Assistant

Sources

1. Kasa Smart Wi-Fi Dimmer Light Switch, Matter — TP-Link manufacturer · accessed Oct 25, 2026
2. Smart Wi-Fi Light Switch, Dimmer | KS225 — Kasa Smart manufacturer · accessed Oct 25, 2026
3. Kasa Smart Wi-Fi Dimmer Switch - CSA-IOT — Connectivity Standards Alliance certification · accessed Oct 25, 2026
4. TP-Link Smart Home - Home Assistant — Home Assistant ecosystem · accessed Oct 25, 2026

Official product page: tp-link.com