Otcboimo Otcboimo Smart Relay Switch
Otcboimo 30A Smart WiFi Relay Switch User Manual
Model: Otcboimo Smart Relay Switch
Brand: Otcboimo
1. Introduction
The Otcboimo 30A Smart WiFi Relay Switch is a versatile device designed for intelligent control of various home appliances. It supports both WiFi and 2.4G wireless remote control, offering convenience and automation for lights, electric kettles, water pumps, and more. This manual provides detailed instructions for installation, setup, operation, and troubleshooting to ensure optimal performance and safety.
2. Important Safety Information
- Electrical Safety: Installation should be performed by a qualified electrician or knowledgeable individual. Ensure power is disconnected before any wiring.
- Load Capacity: Do not exceed the maximum load current of 30A or power of 4000W. Overloading can cause overheating and potential fire hazards.
- Environment: Use the device in a dry environment. Avoid exposure to moisture or extreme temperatures.
- Compatibility: This device operates on a 2.4Ghz WiFi network. Ensure your router supports this frequency and is configured correctly.
3. What's in the Box
- 1 x 30A Smart Switch
- 1 x 2.4G Remote Controller
4. Product Specifications
| Specification | Value |
|---|---|
| Voltage | AC90-250V 50/60Hz |
| Power | 4000W |
| Current | 30A |
| WiFi Frequency | 2.4G. IEEE 802.11 b/g/n |
| Remote Control Frequency | 2.4Ghz |
| Product Dimensions | 3.23 x 1.77 x 1.22 inches |
| Shell Material | ABS V0 |

Image: Product dimensions and specifications overview.
5. Setup and Installation
5.1 Wiring Diagram
Ensure power is off before wiring. The smart switch supports both 120V AC and 240V AC wiring configurations. Connect the input (L and N) and output (L and N) terminals as shown in the diagrams below. For 240V AC, connect L1 and L2 to the input, and L1 and L2 to the load output.

Image: Detailed wiring diagrams for 120V AC (single phase) and 240V AC (dual phase) connections.

Image: Conceptual diagram illustrating how the smart switch integrates into traditional wiring to control a load.
5.2 eWeLink App Setup and Pairing
To control your smart switch via smartphone, download the eWeLink app. Ensure your phone's Bluetooth is enabled and connected to a 2.4G WiFi network. The smart switch requires a 2.4G WiFi connection for initial setup and operation.
- Power on the smart switch.
- Open the eWeLink APP.
- Press and hold the pairing button on the smart switch for more than 5 seconds until the indicator light blinks twice and then stays on briefly. This indicates pairing mode.
- In the eWeLink APP, click the '+' icon (usually in the upper right corner) and select 'Bluetooth Pairing' or 'Add Device'. The app will automatically scan for devices.
- Click on the scanned device, confirm your 2.4G WiFi network, and enter the password.
- Wait for the device to be connected. Once successful, you can rename the device.

Image: The eWeLink App interface displaying the real-time sync status of the connected device.
5.3 2.4G Wireless Switch Pairing
The included 2.4G wireless switch can be paired with the smart relay for local control.
- Ensure the smart switch is powered and added to the eWeLink app.
- In the eWeLink app, navigate to the smart switch's settings (usually by tapping the device, then the three dots or settings icon).
- Find and click on 'eWeLink Remote' or '2.4Ghz remote control setup'.
- Follow the on-screen prompts to add a new remote. This typically involves pressing a button in the app, then pressing the button on the 2.4G wireless switch for 2 seconds.
- Once paired, you will receive a confirmation in the app. Remember to remove the plastic film from the battery of the 2.4G wireless switch before use.
Video: Demonstrates the pairing process for both the eWeLink app and the 2.4G wireless remote control with the 30A smart switch.
6. Operating the Smart Switch
6.1 App Control
Once paired, you can remotely turn on or off connected home appliances (e.g., lights, electric kettles, water pumps) directly from the eWeLink app. The app provides real-time status tracking of your devices.
6.2 Voice Control
The Otcboimo Smart WiFi Relay Switch is compatible with Amazon Alexa and Google Home/Nest. You can control your appliances using simple voice commands after linking your eWeLink account to your voice assistant.

Image: An illustration of how to use voice commands with Amazon Alexa to control the smart switch.
6.3 Timing and Scheduling
The eWeLink app allows you to set up to 8 scheduled, countdown, or loop timers for each device. This feature is ideal for automating daily routines, such as turning lights on/off at specific times or managing water pump operation.

Image: The eWeLink App interface demonstrating options for setting single, repeat, countdown, and loop timers.
6.4 Working Modes: Inching/Self-locking
The smart switch supports two working modes:
- Self-locking Mode: Allows you to remotely turn connected devices on/off immediately and maintain that state until changed.
- Inching Mode: You can set a specific inching time in the app (e.g., 0.5 seconds). The product will automatically turn off after this set time, useful for momentary actions.
7. Maintenance
To ensure the longevity and proper functioning of your smart switch:
- Keep the device clean and free from dust. Use a dry, soft cloth for cleaning.
- Avoid exposing the device to direct sunlight or extreme temperatures.
- Do not attempt to disassemble or repair the device yourself. Contact customer support if issues arise.
8. Troubleshooting
8.1 Device Not Connecting to WiFi
- Ensure your WiFi network is 2.4Ghz. The device does not support 5Ghz networks.
- Check your WiFi password for accuracy.
- Move the smart switch closer to your WiFi router to improve signal strength.
- If your router has a combined 2.4G/5G network, consider separating them or temporarily disabling 5G during pairing. Some routers allow prioritizing 2.4G or setting a different password for it.
- Restart your router and the smart switch.
8.2 Remote Control Not Pairing
- Ensure the plastic film protecting the battery in the 2.4G wireless switch has been removed.
- Follow the pairing steps in section 5.3 carefully, ensuring you press the button on the remote for the specified duration.
- Check if the remote's battery is depleted.
8.3 Device Overheating
- Verify that the connected load does not exceed the maximum current (30A) or power (4000W) ratings of the switch.
- Ensure proper ventilation around the device.
- If overheating persists under normal load, discontinue use immediately and contact customer support.
9. Warranty and Support
For warranty information, technical support, or any inquiries regarding your Otcboimo 30A Smart WiFi Relay Switch, please refer to the contact details provided on the product packaging or the official Otcboimo website. Keep your purchase receipt for warranty claims.
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