{"product_id":"4-channel-wifi-smart-relay-module-ewelink-app-control","title":"4-Channel WiFi Smart Relay Module | eWeLink App Control","description":"\n\u003ch2\u003e4-Channel WiFi Smart Relay Switch Module – eWeLink, Alexa \u0026amp; Google Home Compatible\u003c\/h2\u003e\n\u003cp\u003eTake full control of your home or project automation with the \u003cstrong\u003eAsia-Teco ST-DC4 4-Way WiFi Smart Relay Module\u003c\/strong\u003e. Whether you're automating garage doors, lights, gate motors, or any DC-powered circuit, this compact module delivers professional-grade wireless switching in three flexible modes — all managed from your smartphone or via voice commands.\u003c\/p\u003e\n\n\u003ch3\u003eThree Powerful Work Modes\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMomentary (Inching) Mode:\u003c\/strong\u003e The relay activates briefly and then automatically returns to its default state. Choose between \"turn on for 1s then auto-off\" or \"turn off for 1s then auto-on\" — ideal for door buzzers and pulse-triggered devices.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSelf-Locking Mode:\u003c\/strong\u003e The relay stays in its last triggered state until you change it — perfect for lights, fans, and appliances.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInterlock Mode:\u003c\/strong\u003e Only one channel can be active at a time across the four relays — great for motor direction control or mutually exclusive circuits.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eSwitch between modes at any time with a simple tap of the physical mode button on the board.\u003c\/p\u003e\n\n\u003ch3\u003eSmart App \u0026amp; Voice Control\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eConnects to the \u003cstrong\u003eeWeLink\u003c\/strong\u003e app (iOS \u0026amp; Android) over your 2.4GHz Wi-Fi network\u003c\/li\u003e\n  \u003cli\u003eCompatible with \u003cstrong\u003eAmazon Alexa\u003c\/strong\u003e (Echo, Echo Dot, Amazon Tap) for hands-free voice control\u003c\/li\u003e\n  \u003cli\u003eWorks with \u003cstrong\u003eGoogle Home \u0026amp; Google Nest\u003c\/strong\u003e\n\u003c\/li\u003e\n  \u003cli\u003eIntegrates with \u003cstrong\u003eIFTTT\u003c\/strong\u003e — search \"eWeLink Smart Home\" in the IFTTT app to build custom automations\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eKey App Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eRemote turn on\/off from anywhere\u003c\/li\u003e\n  \u003cli\u003eTiming \u0026amp; countdown schedules\u003c\/li\u003e\n  \u003cli\u003eDevice sharing with family members\u003c\/li\u003e\n  \u003cli\u003eGroup management for multi-relay scenes\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eST-DC4\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWorking Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDC 5V – 36V\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRated Current\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e10A per channel\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWi-Fi Frequency\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e2.4GHz (802.11 b\/g\/n)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRF Remote Frequency\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e433MHz (optional)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNumber of Channels\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e4 (Four independent relays)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSecurity Mode\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFail Secure\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRelay Output\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDry contact (no output power — switches only)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eAsia-Teco\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCountry of Origin\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMade in Mainland China\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cp\u003e\u003cstrong\u003e⚠️ Important Note:\u003c\/strong\u003e The relays are \u003cem\u003edry-contact switches with no output power\u003c\/em\u003e. The DC 5–36V power supply input is for the PCB module only. Ensure your connected loads are wired to their own power sources.\u003c\/p\u003e\n\n\u003ch3\u003eWhy Choose the Asia-Teco ST-DC4?\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e✅ One module replaces four separate smart switches\u003c\/li\u003e\n  \u003cli\u003e✅ Three configurable work modes for versatile automation\u003c\/li\u003e\n  \u003cli\u003e✅ Works on any 2.4GHz Wi-Fi — no hub required\u003c\/li\u003e\n  \u003cli\u003e✅ Voice control via Alexa or Google Home\u003c\/li\u003e\n  \u003cli\u003e✅ IFTTT support for advanced automations\u003c\/li\u003e\n  \u003cli\u003e✅ Compact form factor for easy panel or enclosure mounting\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eFor guidance on safe electrical wiring practices and DIY home automation safety, visit the U.S. Consumer Product Safety Commission – Home Electrical Safety.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: Does the Asia-Teco ST-DC4 WiFi relay module require a hub or bridge?\u003c\/h4\u003e\n\u003cp\u003eA: No hub is required. The ST-DC4 connects directly to your existing 2.4GHz Wi-Fi router and is managed entirely through the free eWeLink app on iOS or Android.\u003c\/p\u003e\n\u003ch4\u003eQ: What is the difference between inching, self-locking, and interlock modes on this smart relay?\u003c\/h4\u003e\n\u003cp\u003eA: Inching (momentary) mode triggers the relay for a brief pulse and then resets automatically — useful for gates or buzzers. Self-locking mode keeps the relay in its last state until manually changed — great for lights and fans. Interlock mode ensures only one of the four relay channels is active at any given time, which is ideal for motor direction or selector switching.\u003c\/p\u003e\n\u003ch4\u003eQ: Can I use this 4-channel WiFi relay module with Amazon Alexa and Google Home?\u003c\/h4\u003e\n\u003cp\u003eA: Yes. Once paired in the eWeLink app, you can link it to Amazon Alexa or Google Home and control each channel using voice commands such as \"Alexa, turn on Channel 1\" or \"OK Google, turn off Channel 2.\"\u003c\/p\u003e\n\u003ch4\u003eQ: What voltage does the ST-DC4 smart switch module operate on?\u003c\/h4\u003e\n\u003cp\u003eA: The module's PCB runs on DC 5V to 36V. The relay contacts themselves are dry-contact (no voltage output), so your connected load will need its own power source wired through the relay terminals.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"Does the Asia-Teco ST-DC4 WiFi relay module require a hub or bridge?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"No hub is required. The ST-DC4 connects directly to your existing 2.4GHz Wi-Fi router and is managed entirely through the free eWeLink app on iOS or Android.\"}}, {\"@type\": \"Question\", \"name\": \"What is the difference between inching, self-locking, and interlock modes on this smart relay?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Inching (momentary) mode triggers the relay for a brief pulse and then resets automatically — useful for gates or buzzers. Self-locking mode keeps the relay in its last state until manually changed — great for lights and fans. Interlock mode ensures only one of the four relay channels is active at any given time, which is ideal for motor direction or selector switching.\"}}, {\"@type\": \"Question\", \"name\": \"Can I use this 4-channel WiFi relay module with Amazon Alexa and Google Home?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes. Once paired in the eWeLink app, you can link it to Amazon Alexa or Google Home and control each channel using voice commands such as \\\"Alexa, turn on Channel 1\\\" or \\\"OK Google, turn off Channel 2.\\\"\"}}, {\"@type\": \"Question\", \"name\": \"What voltage does the ST-DC4 smart switch module operate on?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The module's PCB runs on DC 5V to 36V. The relay contacts themselves are dry-contact (no voltage output), so your connected load will need its own power source wired through the relay terminals.\"}}]}\u003c\/script\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"BreadcrumbList\", \"itemListElement\": [{\"@type\": \"ListItem\", \"position\": 1, \"name\": \"Home\", \"item\": \"https:\/\/kujrmc-0q.myshopify.com\/\"}, {\"@type\": \"ListItem\", \"position\": 2, \"name\": \"Electronics \u0026 Tech\", \"item\": \"https:\/\/kujrmc-0q.myshopify.com\/collections\/electronics-tech\"}, {\"@type\": \"ListItem\", \"position\": 3, \"name\": \"4-Channel WiFi Smart Relay Module | eWeLink App Control\", \"item\": \"https:\/\/kujrmc-0q.myshopify.com\/products\/4-channel-wifi-smart-relay-module-ewelink-app-control\"}]}\u003c\/script\u003e","brand":"Vue","offers":[{"title":"ST-DC4 Module","offer_id":48751872442560,"sku":"14:200004889#ST-DC4 Module","price":78.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0772\/9338\/7968\/files\/H443bf9ae7f934990b0bb20bc2bb8b297P.webp?v=1786242693","url":"https:\/\/vueselect.com\/products\/4-channel-wifi-smart-relay-module-ewelink-app-control","provider":"Vue","version":"1.0","type":"link"}