1. Introduction
This manual provides detailed instructions for the installation, operation, and maintenance of your meross Smart Light Switch (Model MSS510). Please read this manual thoroughly before installation and retain it for future reference.

Image 1.1: meross Smart Light Switch MSS510 4-pack packaging and individual switches.
2. Important Safety Information
WARNING: Risk of Electric Shock. Improper installation can be dangerous or illegal. Consult a qualified electrician if you are unfamiliar with electrical wiring.
- Neutral Wire Required: Ensure your electrical box has a neutral wire (typically white) before purchasing and installation. This switch will not function without a neutral wire.
- Single Pole Installation Only: This switch is designed for single-pole circuits where one switch controls one light. It is not compatible with 3-way or multi-way switch configurations.
- Not a Dimmer Switch: The MSS510 is an ON/OFF switch and does not support dimming functions. Do not attempt to use it with dimmable bulbs or fixtures requiring a dimmer.
- 2.4GHz Wi-Fi Only: The device operates exclusively on a 2.4GHz Wi-Fi network. It does not support 5GHz Wi-Fi.
- Maximum Load: Do not exceed the maximum load of 15 Amps or 1875 Watts.
- Indoor Use Only: This device is intended for indoor use in dry locations.

Image 2.1: Key pre-installation considerations including neutral wire, single pole, and 2.4GHz Wi-Fi requirements.
3. Package Contents
- meross Smart Light Switch (MSS510) x 4
- User Manual x 1
4. Product Overview
The meross Smart Light Switch MSS510 is a Wi-Fi enabled wall switch designed to replace traditional single-pole light switches. It allows for remote control, voice control, and scheduling of your lighting via the meross app and compatible smart home platforms.
4.1 Physical Features
- Switch Button: Press to manually turn lights ON/OFF.
- LED Indicator: Indicates Wi-Fi status and switch status.

Image 4.1: Front view of the meross Smart Light Switch, highlighting it is not a dimmer.
5. Setup and Installation
5.1 Pre-installation Checklist
- Confirm your electrical box has a neutral wire (usually white).
- Verify your existing switch is a single-pole switch (controls the light from one location).
- Ensure you have a 2.4GHz Wi-Fi network available.
- Confirm the total wattage of your light fixture does not exceed 1875W.

Image 5.1: Visual guide for identifying a single pole switch setup.
5.2 Wiring Instructions
- Turn off Power: Locate your circuit breaker and turn off the power to the light switch you are replacing. Verify power is off using a voltage tester.
- Remove Old Switch: Carefully remove the existing wall plate and unscrew the old switch from the wall box. Disconnect the wires.
- Identify Wires: Identify the Live (Hot), Load, Neutral, and Ground wires. The neutral wire is typically white, ground is green or bare copper.
- Connect meross Switch: Connect the wires from your wall box to the corresponding terminals on the meross Smart Light Switch. Refer to the diagram below for proper connections.
- Live Wire to 'L' terminal
- Load Wire to 'L1' terminal
- Neutral Wire to 'N' terminal
- Ground Wire to 'GND' terminal
- Secure Switch: Gently push the meross switch into the wall box and secure it with screws. Attach the new wall plate.
- Restore Power: Turn the power back on at the circuit breaker. The LED indicator on the switch should begin to flash, indicating it's ready for pairing.

Image 5.2: Wiring diagram for the meross Smart Light Switch, illustrating connections for Live, Load, Neutral, and Ground wires.
5.3 App Installation and Device Pairing
- Download meross App: Scan the QR code provided in the package or search for 'meross' in the Apple App Store or Google Play Store to download the app.
- Create Account: Open the meross app and create a new account or log in to an existing one.
- Add Device: Tap the '+' icon in the top right corner of the app to add a new device. Follow the on-screen instructions to select your MSS510 Smart Light Switch.
- Connect to Wi-Fi: When prompted, connect your smartphone to the meross device's Wi-Fi hotspot (e.g., 'meross_XXXX'). Then, select your home 2.4GHz Wi-Fi network and enter the password.
- Complete Setup: Once connected, you can name your switch and assign it to a room.
6. Operating Instructions
6.1 Manual Control
Press the physical button on the meross Smart Light Switch to manually turn the connected light ON or OFF.
6.2 Remote Control via meross App
Control your light from anywhere using the meross app on your smartphone or tablet. Ensure your device is connected to the internet.

Image 6.1: Remote control functionality demonstrated with the meross app.
6.3 Voice Control
The meross Smart Light Switch is compatible with Amazon Alexa and Google Assistant. Link your meross account to your Alexa or Google Home app to enable voice commands.
- For Amazon Alexa: "Alexa, turn on the [Light Name]"
- For Google Assistant: "Hey Google, turn off the [Light Name]"

Image 6.2: Voice control integration with Amazon Alexa and Google Assistant.
6.4 Scheduling and Timers
Use the meross app to set schedules, timers, and routines for your lights. This allows for automated control based on time of day, sunrise/sunset, or other custom conditions.

Image 6.3: Examples of scene and schedule settings within the meross app.
6.5 Offline Control
If your internet connection is down, you can still control your meross Smart Light Switch locally via the meross app, provided your smartphone is connected to the same Wi-Fi network as the switch.

Image 6.4: Offline control capability within the local Wi-Fi network.
7. Maintenance
The meross Smart Light Switch requires minimal maintenance. To ensure optimal performance and longevity:
- Cleaning: Wipe the surface with a soft, dry cloth. Do not use harsh chemicals or abrasive cleaners.
- Environment: Ensure the switch is installed in a dry, indoor environment, away from excessive heat or moisture.
8. Troubleshooting
8.1 Switch Not Responding / No Power
- Check your circuit breaker to ensure power is restored to the switch.
- Verify all wiring connections are secure and correct, especially the neutral wire.
- Ensure the light bulb is functioning correctly.
8.2 Cannot Connect to Wi-Fi
- Confirm your Wi-Fi network is 2.4GHz. The switch does not support 5GHz Wi-Fi.
- Ensure your Wi-Fi router is within range of the switch.
- Check your Wi-Fi password for accuracy.
- Try restarting your Wi-Fi router and the meross switch (by turning off/on the circuit breaker).
- Perform a factory reset on the switch (refer to meross app for specific instructions if available, or hold the button for 5 seconds until LED flashes rapidly).
8.3 Voice Control Not Working
- Ensure your meross account is correctly linked to your Amazon Alexa or Google Home app.
- Check the device name in the meross app and ensure it matches the name used in voice commands.
- Verify your smart speaker is connected to the internet.
9. Specifications
| Specification | Value |
|---|---|
| Model Number | MSS510 |
| Operation Mode | Automatically, Off |
| Current Rating | 15 Amps |
| Operating Voltage | 125 Volts |
| Contact Type | On-off-on |
| Connector Type | Screw Terminals |
| Terminal | SPST |
| Item Dimensions (L x W x H) | 4.7 x 2.8 x 1.5 inches |
| Circuit Type | 1-way (Single Pole) |
| Actuator Type | Push Button |
| Contact Material | Plastic |
| International Protection Rating | IP00 |
| Number of Positions | 2 |
| Controller Type | Amazon Alexa, Android, Google Assistant, SmartThings, iOS |
| Control Method | Remote |
| Connectivity Protocol | Wi-Fi (2.4GHz only) |
| Wattage | 1875 watts |
| Item Weight | 1.23 pounds |
10. Warranty and Support
meross products come with a standard manufacturer's warranty. For detailed warranty information, please refer to the warranty card included with your product or visit the official meross website.
If you encounter any issues or have questions regarding your meross Smart Light Switch, please contact meross customer support:
- Website: www.meross.com
- Email: Refer to the meross website for support contact email.







