Question 1

Can I use only one 3-way switch where 2 switches control the same light or should I need to install a pair of these?

Accepted Answer

You could replace both only if you can't figure out which one you need to replace. I have 4 switches that control my hallway lights and I replaced only 1 and it works perfectly. As others have said, you need to replace the one switch that sends feedback to the other switches the state of the light. I must have got lucky because I didn't know which one that was.

Here's a hint though when I had to search for answers: 2 of the switches contained 5 wires: 2 black, 2 red, and 1 ground. The other 2 switches had 4 wires: 2 black, 1 red, and 1 ground.

I replaced the switch with 4 wires because this smart switch had 4 wires to connect. I connected the common wire to the common port on the smart switch. Then I connected 1 red and 1 black write that came from the same "bundle wire" in the switch box to the traveler wires port on the smart switch and voila. App works, other dumb switches work perfectly. There's no having to leaving other dumb switches on or off. Turning on the light using the dumb switch sends feedback to the smart switch and it changes the state.

Question 2

Will one switch work on a 4-way configuration (3 switches controlling 1 light)?

Accepted Answer

Tldr: I'm pretty sure you need to replace both 3 way switches in a 4 way circuit, at least if you want it to work as intended.

Fwiw: I did not get a 4 way system to work with only one kasa 210. It kinda worked (could switch in some states, Alexa /kasa never knew of the light was on it not). But checking the tp link forum, users had success by switching out the 3 way switches. So, for my 4 way switch (3way then 4way then 3 way) I replaced BOTH 3 way switches with Kasas. Very important... Leave both switches in the setup state (blinking orange and green, delete from app if you already setup). Setup wifi on only 1 switch. Kasa app will ask if you replaced 2 switches in the circuit, say yes. Follow the directions very carefully (they are different than the usual wifi config, note that you are looking for orange/red blinking this time). If you do this correctly, you will ONLY HAVE 1 SWITCH LISTED IN THE APP! If you have both switches listed independently, you did it wrong and will need to start over (delete/reset, etc). Though only 1 switch shows up, they both work and the circuit can be controlled by voice.

Question 3

Can you fit one of these in a bix with two plates or do you need to use the plate it comes with

Accepted Answer

You do not need to use the plate it comes with.

Question 4

Need a Kasa 3-way Dimmer switch..When will the become available

Accepted Answer

Available now https://www.amazon.com/Kasa-Smart-KIT-SmartThings-KS230-dp-B09CX9G1WT/dp/B09CX9G1WT/ref=dp_ob_title_hi?th=1

Operation Mode	ON-OFF
Current Rating	10 Amps
Operating Voltage	120 Volts (AC)
Contact Type	Normally Open
Connector Type	Clamp
Brand	Kasa Smart
Terminal	Spst
Item dimensions L x W x H	10.5 x 4.3 x 4.5 Centimeters
Circuit Type	3-way
Actuator Type	Toggle
Contact Material	Plastic
International Protection Rating	IP00
Number of Positions	3
Upper Temperature Rating	104 Degrees Fahrenheit
Controller Type	Amazon Alexa
Control Method	Voice
Connectivity Protocol	Wi-Fi
Colour	white
Wattage	600 Watts
Net Quantity	1.0 count
Number of Items	1
Manufacturer	TP-Link
Country of Origin	USA
Model number	HS210
Special Feature	Dimmable
Item Weight	159 g
Product Dimensions	10.49 x 4.34 x 4.5 cm; 159 g
Item model number	HS210
Item Height	1.77 Inches
Item Width	1.71 Inches
Voltage	110 Volts
Included Components	1 x Kasa Smart 3-way Switch

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Kasa 3 Way Smart Switch by TP-Link, Wifi Light Switch Compatible with Alexa and Google Home, Neutral Wire Required, No Hub Required, UL Certified, 1-Pack(HS210)

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