Page 1
User Manual
Installation for 3-Way & 4-Way Wi-Fi Switches
Model: US-ST01, US-STD-KN01, US-STD-TC01
Feb 2021
By Martin Jerry
Content
1. Power off the break ................................................................................................................................ 1
2. Find Neutral Wires at the Live Side. .................................................................................................. 1
Video1: How to find a neutral wire? ....................................................................................................... 1
3. Connect wires according the marks on the switch. ...................................................................... 2
4. FQA: ........................................................................................................................................................... 3
5. Wiring Examples ..................................................................................................................................... 4
Video2: How to find correct wires for 3-way ......................................................................................... 4
Figure 1 - Identify neutral wires ................................................................................................................................... 1
Figure 2 - Wiring Diagram for 3-way & 4-way Circuit .................................................................................................. 2
Figure 3 - Wiring Example of 3-way switch .................................................................................................................. 4
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Page 2
User Manual - Installation
Neutral
Model: ST01, US-STD-KN01, US-STD-TC01
1. Power off the break
2. Find Neutral Wires at the Live Side.
The Wi-Fi switch must be installed at the Live Line side of the 3-way circuit.
Make sure there is a neutral wire at the live side for the Wi-Fi switch. If not, the switches cannot work
properly. Neutral wires are white and NOT used by your old switch. You can send us photos of the
wires at both 3-way switch locations for assistance.
Email: martinjerry01@outlook.com
Video1: How to find a neutral wire?
https://youtu.be/p2qzhD9Mz_w
Figure 1 - Identify neutral wires
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Page 3
User Manual - Installation
4-Way
Non-Smart
Existing Wiring Part
Don’t Need to Change
Model: ST01, US-STD-KN01, US-STD-TC01
3. Connect wires according the marks on the switch.
Figure 2 - Wiring Diagram for 3-way & 4-way Circuit
Tips:
Wires on your old non-smart 3-way switches are:
1st Switch: Live, TRA1, TRA2
2nd Switch: Load, TRA1, TRA2
TRA-1 & TRA-2 is very easy to identify. Generally 1red, 1black. They come from the same wire jacket.
Neutral wires are not used by your old switch and capped in the outlet box.
Recommended Connection procedures
1.1. Connect Ground Wire (Copper or Green. This is not necessary)
1.2. Connect Neutral Wire (White, not on old switch. This is necessary for Wi-Fi switch)
1.3. Connect Live Wire (Black, hot wire on old switch)
1.4. Turn on the breaker, and the indicator on the switch will light up. If not, send us a photo of the wiring
1.5. Turn of the breaker
1.6. Connect TRA-1 & TRA-2 (Two wires to your traditional switch)
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User Manual - Installation
NO
YES
Model: ST01, US-STD-KN01, US-STD-TC01
4. FQA:
1. How can I know it is connected correctly?
A: Press the power button on both smart and your traditional switch. They should work properly.
2. I cannot find the neutral wire in both outlet boxes; can I still use this 3-way dimmer switch?
A: No, the neutral wire is necessary for the Smart Switch.
Although old switches do not need a neutral wire, there are spare white neutral wires in common outlet
boxes. Please send us photos of the wires inside the outlet boxes for assistance.
3. How can I find which one is the live (hot) line, neutral wire?
A: Besides the ground wire, there are three wires on your old switch in general:
1 black & 1 red wire from the same location, they are TRA-1 & TRA-2;
1 black wire from another location, it is live or load. You can use a tester to test it.
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Page 5
User Manual - Installation
Figure 3 - Wiring Example of 3-way switch
3
2
1
4
5
Wi-Fi Switch
1 -- > Live
2 -- > TRA1
3 -- > TRA2
4 -- > Neutral (white wires)
5 -- > Ground
Model: ST01, US-STD-KN01, US-STD-TC01
5. Wiring Examples
Video2: How to find correct wires for 3-way
https://www.youtube.com/watch?v=Xp4FWJRzHdo
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