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

ASIN	B083JKTMYQ
Actuator Type	Push Button
Best Sellers Rank	#2,706 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #10 in Electrical Light Switches
Brand Name	Kasa Smart
Circuit Type	3-way
Color	white
Connectivity Protocol	Wi-Fi
Connector Type	Clamp
Contact Material	Plastic
Contact Type	Normally Closed
Control Method	App
Controller Type	Google Assistant
Current Rating	15 Amps
Customer Reviews	4.6 4.6 out of 5 stars (19,779)
Included Components	Smart Light Switch, 3-Way, Wall Plate, 2 Wire Nuts, Quick Start Guide
International Protection Rating	IP00
Item Dimensions	4.13 x 1.71 x 1.77 inches
Lower Temperature Rating	32 Degrees Fahrenheit
Manufacturer	TP-Link
Material Type	Polycarbonate
Model	HS210
Mounting Type	Wall Mount
Number of Items	1
Operating Voltage	120 Volts (AC)
Operation Mode	ON-OFF-ON
Switch Type	Temperature Switch
Terminal	Spst
UPC	845973087401 840460604963
Unit Count	1.0 Count
Upper Temperature Rating	104 Degrees Fahrenheit
Warranty Description	2 year manufacturer
Wattage	600 watts

3 Way Switch HS210, Needs Neutral Wire, 2.4GHz Wi-Fi Light Switch works with Alexa and Google Home, UL Certified, No Hub Required, white

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