1. Introduction
The SURAIELEC TW02A Wi-Fi Smart Timer Switch is designed for controlling outdoor electrical devices with convenience and efficiency. This 35 AMP, 120V timer switch is suitable for various applications including pool pumps, outdoor lighting, security systems, and holiday decorations. It integrates with your home Wi-Fi network, allowing remote control and scheduling via a smartphone application.
This manual provides detailed instructions for the safe installation, operation, and maintenance of your smart timer switch. Please read it thoroughly before installation and retain it for future reference.
2. Safety Information
WARNING: Risk of electric shock. Improper installation or use can lead to serious injury or death. Always consult a qualified electrician if you are unsure about any part of the installation process.
- Disconnect power at the circuit breaker before installing or servicing the device.
- Ensure all wiring connections are secure and comply with local electrical codes.
- This device is designed for 120V AC, 50-60Hz electrical systems. Do not exceed the maximum load of 35 Amps or 4200 Watts.
- A neutral wire is required for operation.
- The device is weatherproof for outdoor use, but ensure all connections are properly sealed and protected from direct water ingress.
- Do not attempt to disassemble or modify the device. There are no user-serviceable parts inside.
3. Package Contents
Verify that all items are present in your package:
- SURAIELEC TW02A Wi-Fi Smart Timer Switch
- Pre-attached 2.2 ft wiring leads (Black, Red, White)
- Mounting Screws and Wall Anchors
- Wire Nuts
- Conduit Connector and Gasket
- User Manual (this document)

4. Specifications
| Model Number | TW02A |
| Operating Voltage | 120V AC, 50/60Hz |
| Max Current Rating | 35 Amps |
| Max Power Rating | 4200 Watts |
| Wi-Fi Standard | 2.4 GHz (IEEE 802.11 b/g/n) |
| Operating Temperature | Refer to product labeling |
| Dimensions (L x W x H) | 5.9 x 3.9 x 2 inches (approximate) |
| Cable Length | 2.2 ft (pre-attached) |
| Compatibility | Tuya Smart Life App, Amazon Alexa, Google Assistant |
5. Setup and Installation
5.1 Pre-Installation Checklist
- Ensure power is OFF at the circuit breaker before starting.
- Confirm you have a 2.4 GHz Wi-Fi network available at the installation location.
- Gather necessary tools: screwdriver, wire strippers, voltage tester.
- Identify the electrical box or enclosure where the timer will be installed.

5.2 Mounting the Timer Switch
- Select a suitable outdoor location for mounting, ensuring it is within range of your 2.4 GHz Wi-Fi network.
- Use the provided mounting screws and anchors to securely attach the timer switch to a wall or suitable surface. The device features three mounting holes for stable installation.
- Ensure the timer is mounted vertically with the conduit connection facing downwards to maintain its weatherproof rating.

5.3 Wiring Instructions
The timer switch comes with pre-attached 2.2 ft wiring leads for convenient installation. Ensure all connections are made inside a suitable electrical enclosure (e.g., junction box, power distribution box) and are protected from the elements.
- Identify Wires: The timer has three wires: Black (Line/Supply In), Red (Load/Supply Out), and White (Neutral).
- Connect Line (Input Power): Connect the Black wire from the timer to the incoming 120V AC Line (hot) wire from your power source.
- Connect Load (Output Power): Connect the Red wire from the timer to the Line (hot) wire of the device you wish to control (e.g., pool light, outdoor outlet).
- Connect Neutral: Connect the White wire from the timer to the Neutral wire of your electrical system. A neutral wire connection is essential for the timer to function.
- Grounding: Ensure your electrical system is properly grounded according to local codes. The timer itself does not have a separate ground wire, but relies on the grounding of the enclosure it is installed in.
- Secure all connections with wire nuts and ensure no bare wires are exposed.

5.4 App Installation and Wi-Fi Connection
- Download the App: Search for "Tuya Smart Life" in your smartphone's app store (iOS 8.0+ or Android 4.1+).
- Register/Log In: Open the app and create a new account or log in if you already have one.
- Add Device: Power on the timer switch. The indicator light on the timer should blink rapidly (or enter pairing mode by pressing and holding the button for 5 seconds). In the app, tap "+" or "Add Device" and select "Electrician" > "Switch (Wi-Fi)" or allow the app to auto-discover the device.
- Connect to Wi-Fi: Enter your 2.4 GHz Wi-Fi network name and password. The app will guide you through the connection process. The indicator light on the timer will become solid once connected.
- Rename Device: Once connected, you can rename the device for easier identification (e.g., "Pool Light Timer").

6. Operating Instructions
6.1 Manual Control
Press the physical button on the timer switch once to manually turn the connected device ON or OFF. The indicator light will change state to reflect the current status.
6.2 App Control (Tuya Smart Life)
The Tuya Smart Life app provides comprehensive control over your timer switch:
- Power ON/OFF: Tap the main power button in the app to instantly turn the connected device on or off.
- Schedule: Set specific ON/OFF times for each day of the week. This is ideal for recurring events like daily pool pump operation or evening landscape lighting.
- Countdown: Set a timer for the device to turn off after a specified duration.
- Circulate: Program the device to cycle ON and OFF repeatedly for set intervals.
- Random: Activate a random ON/OFF schedule within a set timeframe to simulate occupancy, enhancing security.
- Astronomical Timer: Utilize local sunrise/sunset times to automatically adjust ON/OFF schedules, perfect for outdoor lighting.


6.3 Voice Control Integration
The SURAIELEC TW02A is compatible with Amazon Alexa and Google Assistant for convenient voice control:
- Link Accounts: In the Alexa or Google Home app, navigate to the "Skills" or "Works with Google" section and search for "Smart Life." Enable the skill/service and link your Smart Life account.
- Discover Devices: Once linked, ask your voice assistant to "Discover devices."
- Voice Commands: You can now control your timer switch using voice commands. For example:
- "Alexa, turn on Pool Light."
- "Hey Google, turn off Outdoor Decorations."

7. Maintenance
The SURAIELEC TW02A Smart Timer Switch is designed for minimal maintenance. Follow these guidelines to ensure optimal performance and longevity:
- Regular Inspection: Periodically check the device and its wiring connections for any signs of damage, wear, or corrosion.
- Cleaning: If necessary, gently wipe the exterior of the device with a soft, damp cloth. Do not use harsh chemicals or abrasive cleaners. Ensure the device is powered off before cleaning.
- Firmware Updates: Keep the Tuya Smart Life app updated to the latest version to receive any potential firmware updates for the device, which may improve performance or add features.
- Environmental Protection: While weatherproof, avoid submerging the device in water or exposing it to extreme environmental conditions beyond its operating specifications.
8. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Device does not power on. | No power to the circuit; incorrect wiring; faulty device. | Check circuit breaker. Verify wiring connections (Line, Neutral, Load). Test power with a voltage tester. If issues persist, contact support. |
| Cannot connect to Wi-Fi. | Incorrect Wi-Fi password; 5 GHz network used; device too far from router; router issues. | Ensure correct 2.4 GHz Wi-Fi password. Move device closer to router (within 80 ft in free area). Restart router. Reset device to pairing mode (press button for 5 seconds) and try again. |
| App control is unresponsive. | No internet connection; device offline; app glitch. | Check internet connection on your phone and router. Verify the device is online in the app. Close and reopen the app. Restart the timer switch by cycling power. |
| Scheduled events not executing. | Incorrect schedule settings; device offline; time zone issues. | Review schedule settings in the app. Ensure the device is connected to Wi-Fi. Check the time zone setting in the app. |
9. Warranty and Support
SURAIELEC products are manufactured to high-quality standards. For warranty information, technical support, or assistance with your TW02A Wi-Fi Smart Timer Switch, please contact SURAIELEC customer service through the retailer where the product was purchased or visit the official SURAIELEC website for contact details.
Please have your model number (TW02A) and purchase date available when contacting support.