SWITNEX EW-4CH 4-Channel WiFi Smart Switch User Manual

2026年05月16日

SWITNEX EW-4CH 4-Channel WiFi Smart Switch User Manual

Technical Data
Model Number	EW-4CH
Product Dimensions	65 x 48 x 17 mm (2.6 x 1.9 x 0.7 inches)
Weight	60 g
Input Voltage	DC 5V (USB) or DC 7V-48V (Terminal)
Output Type	Passive Output (Dry Contacts)
Relay Current Rating	10 Ampere per channel
Contact Type	Normally Open (NO), Normally Closed (NC), Common (COM)
Connectivity	2.4 GHz WiFi
Control Modes	APP Control (eWelink), Voice Control (Alexa/Google Home), Optional Bluetooth Remote Control
Operating Modes	Inching (Momentary), Self-locking (Toggle)
Number of Channels	4
WiFi Frequency	2.4 GHz only (does not support 5 GHz)

Product Detail

EW-4CH Module Overview

4-channel WiFi smart switch relay module – compact size (65x48x17 mm)
4 independent relays – each with NO, COM, NC terminals (potential-free dry contacts)
Power input options: DC 5V via Micro USB, or DC 7V-48V via terminal block
Pairing button – for WiFi configuration and factory reset
WiFi indicator light – shows connection status
Relay indicator lights – show each relay’s ON/OFF state
Compatible with eWelink APP (Android and iOS)
Voice control – Amazon Alexa and Google Home compatible
Optional RM2.4G Bluetooth remote control (not included)

Wiring Diagram

Power Input Options - DC 7V-48V Terminal and DC 5V USB Wiring Modes for DC and AC Devices

Power input: DC 5V (USB) or DC 7V-48V (terminal)
Relay connections: NO (Normally Open), COM (Common), NC (Normally Closed)
Each relay is passive output – external power required for connected devices

Warning

Always disconnect power before performing any wiring or installation to prevent electric shock.
Improper installation or use can be dangerous. If unsure, consult a qualified electrician.
Do not exceed the maximum current rating of 10A per relay.
Ensure proper insulation for all connections.
Operate the device within specified voltage range (DC 5V or DC 7V-48V).
Keep the device away from water, moisture, and extreme temperatures.
This device supports 2.4 GHz WiFi only. It does not work with 5 GHz networks.

Operating Mode

The EW-4CH supports two main operating modes, configurable independently for each relay via the eWelink APP.

Inching Mode (Momentary)

When activated, the relay turns ON for a set duration (0.5 to 3600 seconds) and then automatically turns OFF. Suitable for garage door openers or pulse-triggered devices.

How to configure: Set the desired inching time in the eWelink APP for each relay.

Self-locking Mode (Toggle)

Each activation toggles the relay state – one press turns ON, another press turns OFF. Suitable for traditional on/off control of lights or appliances.

How to configure: Select self-locking mode in the eWelink APP for each relay.

APP Control

Download the eWelink APP from your device’s app store (Android/iOS) or scan QR code.
Create an account or log in.
Tap the ’+’ icon to add a device.
Follow in-app instructions to put the module into pairing mode (press and hold pairing button until WiFi indicator blinks).
Connect to your 2.4 GHz WiFi network.
Once paired, control devices remotely from anywhere.

Voice Control

Link your eWelink account to Amazon Alexa or Google Home for hands-free control.

Use commands like: “Alexa, turn on the light” or “Hey Google, open the garage door.”

Scheduling and Timers

The eWelink APP allows setting schedules, timers, and countdowns for automated device operation (e.g., turn lights on/off at specific times).

Reset

To reset the device to factory settings (clear all WiFi and pairing data):

Press and hold the pairing button on the module for approximately 5 seconds until the WiFi indicator light flashes rapidly.
Release the button. The device is now reset and ready to be paired again via the eWelink APP.

Troubleshooting

If the device cannot operate normally, try the following steps:

Device not connecting to WiFi: Ensure your WiFi is 2.4 GHz (5 GHz not supported). Check WiFi signal strength. Verify password is correct. Reset device and re-pair.
Device not responding to APP/voice commands: Check WiFi connection (indicator light should be solid). Ensure smartphone has internet. Update eWelink APP. For voice control, verify account linking.
Relay not activating/deactivating: Check power supply to module. Verify wiring to NO/COM/NC terminals. Ensure load current does not exceed 10A. Check operating mode settings in APP.

Maintenance

Keep the device clean and free from dust. Use a dry, soft cloth for cleaning.
Avoid exposing the device to direct sunlight, high humidity, or corrosive environments.
Regularly check wiring connections to ensure they are secure.
Ensure adequate ventilation if installed in an enclosed space.