{"product_id":"32-channel-20a-modbus-relay-board-rs485-ethernet-tcp-ip-dc-12v-24v","title":"32-Channel 20A Modbus Relay Board RS485 Ethernet DC 12V\/24V","description":"\n\u003ch2\u003e32-Channel 20A High-Current Modbus Relay Board with RS485 \u0026amp; Ethernet (DC 12V\/24V)\u003c\/h2\u003e\n\u003cp\u003eTake full control of your automation setup with this professional-grade \u003cstrong\u003e32-Channel Modbus Relay Module\u003c\/strong\u003e. Designed for industrial and smart-home applications alike, it supports both \u003cstrong\u003eRS485 serial communication\u003c\/strong\u003e and \u003cstrong\u003eEthernet (TCP\/IP)\u003c\/strong\u003e via an RJ45 network port, giving you flexible integration options with PLCs, SCADA systems, and home-automation controllers.\u003c\/p\u003e\n\u003cp\u003eEach relay handles up to \u003cstrong\u003e20A of load current\u003c\/strong\u003e, making this board suitable for driving heavy-duty equipment such as LED lamp drivers, motorized curtains, PTZ cameras, and security systems. Built-in \u003cstrong\u003eTVS anti-surge protection\u003c\/strong\u003e safeguards the board and connected devices from voltage spikes.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMade in Mainland China.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003e20A high-current relays\u003c\/strong\u003e — handles demanding loads with ease\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDual communication interfaces\u003c\/strong\u003e: RS485 serial port \u0026amp; RJ45 Ethernet (TCP\/IP)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFull Modbus RTU support\u003c\/strong\u003e: Old commands (03, 06, 16) \u0026amp; New commands (01, 05, 03, 06, 16)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFactory-reset via network port\u003c\/strong\u003e — quick recovery without physical access\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTVS anti-surge protection\u003c\/strong\u003e for reliable long-term operation\u003c\/li\u003e\n  \u003cli\u003eUp to \u003cstrong\u003e64 devices in parallel\u003c\/strong\u003e under Modbus command mode\u003c\/li\u003e\n  \u003cli\u003eConfigurable baud rates: 2400 \/ 4800 \/ 9600 \/ 19200 \/ 38400 \/ 57600 \/ 115200 BPS (default 9600 BPS)\u003c\/li\u003e\n  \u003cli\u003eAdjustable parity: None, Even, or Odd\u003c\/li\u003e\n  \u003cli\u003eConfigurable data send\/return delay up to 1000ms\u003c\/li\u003e\n  \u003cli\u003eRelay modes: Open, Close, Momentary, Self-locking, Interlock, Delay\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable style=\"width:100%; border-collapse:collapse;\"\u003e\n  \u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eOperating Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eDC 12V or DC 24V (version dependent)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eNumber of Channels\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e32\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eMaximum Load\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e20A\/250VAC, 20A\/125VAC, 20A\/30VDC, 20A\/28VDC, 20A\/12VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eDrive Current per Relay\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e70mA; all 32 relays ON requires ~28.8W power adapter\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eStandby Current (all relays closed)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e15mA\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eCommunication\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eRS485 \/ Ethernet RJ45 (TCP\/IP, Modbus RTU)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eDefault Baud Rate\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e9600 BPS\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e\u003cstrong\u003ePCB Dimensions\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e310 × 122 × 25 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eWith Din Rail Box\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e320 × 132 × 46 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e1000g (PCB only) \/ 1100g (with Din Rail Box)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eEU LVD Compliance\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eLow voltage: Below 50VAC or 75VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eCountry of Origin\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eMainland China\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eTypical Applications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003ePLC I\/O expansion boards\u003c\/li\u003e\n  \u003cli\u003eSmart home \u0026amp; home automation systems\u003c\/li\u003e\n  \u003cli\u003ePTZ and IP camera control\u003c\/li\u003e\n  \u003cli\u003eSecurity monitoring \u0026amp; access identification systems\u003c\/li\u003e\n  \u003cli\u003eLED lamp driver switching\u003c\/li\u003e\n  \u003cli\u003eAutomated curtain and blind control\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003ePackage Contents\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1× 32-Channel 20A Modbus Relay Module\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eImportant Notes\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eColors may appear slightly different due to monitor and lighting variations.\u003c\/li\u003e\n  \u003cli\u003ePlease allow ±1–3 cm tolerance due to manual measurement.\u003c\/li\u003e\n  \u003cli\u003eEach relay requires 0.9W drive power. All 32 relays ON simultaneously requires a ≥28.8W power adapter.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eFor guidance on safe electrical wiring and relay installation, refer to the \u003ca href=\"https:\/\/www.osha.gov\/electrical\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eOSHA Electrical Safety guidelines\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What communication protocols does this 32-channel Modbus relay board support?\u003c\/h4\u003e\n\u003cp\u003eA: The board supports both RS485 serial (Modbus RTU) and Ethernet TCP\/IP communication via an RJ45 network port. It is compatible with Modbus RTU old function codes (03, 06, 16) by default, and new function codes (01, 05, 03, 06, 16) with the M0 configuration. Commands can be entered via a serial HyperTerminal, serial assistant, or Modbus Poll software.\u003c\/p\u003e\n\u003ch4\u003eQ: Can I run multiple relay boards on the same RS485 network?\u003c\/h4\u003e\n\u003cp\u003eA: Yes. Under Modbus command mode, up to 64 devices can be connected in parallel on the same RS485 bus, making this board ideal for large-scale industrial or home-automation deployments.\u003c\/p\u003e\n\u003ch4\u003eQ: What power supply do I need for all 32 relays to operate simultaneously?\u003c\/h4\u003e\n\u003cp\u003eA: Each relay consumes approximately 0.9W of drive power (70mA at 12V\/24V). With all 32 relays energized at the same time, you will need a power adapter rated at a minimum of 28.8W at your chosen operating voltage (12V or 24V DC).\u003c\/p\u003e\n\u003ch4\u003eQ: What is the maximum current each relay can switch?\u003c\/h4\u003e\n\u003cp\u003eA: Each relay on this board is rated for a maximum of 20A. It supports load voltages up to 250VAC, 125VAC, 30VDC, 28VDC, and 12VDC, making it suitable for high-current AC and DC applications.\u003c\/p\u003e\n\u003ch4\u003eQ: How do I reset the network settings to factory defaults?\u003c\/h4\u003e\n\u003cp\u003eA: This board features a built-in network port factory reset function. You can restore factory settings directly through the network interface without needing to physically access or modify the board's hardware.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What communication protocols does this 32-channel Modbus relay board support?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The board supports both RS485 serial (Modbus RTU) and Ethernet TCP\/IP communication via an RJ45 network port. It is compatible with Modbus RTU old function codes (03, 06, 16) by default, and new function codes (01, 05, 03, 06, 16) with the M0 configuration. Commands can be entered via a serial HyperTerminal, serial assistant, or Modbus Poll software.\"}}, {\"@type\": \"Question\", \"name\": \"Can I run multiple relay boards on the same RS485 network?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes. Under Modbus command mode, up to 64 devices can be connected in parallel on the same RS485 bus, making this board ideal for large-scale industrial or home-automation deployments.\"}}, {\"@type\": \"Question\", \"name\": \"What power supply do I need for all 32 relays to operate simultaneously?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Each relay consumes approximately 0.9W of drive power (70mA at 12V\/24V). With all 32 relays energized at the same time, you will need a power adapter rated at a minimum of 28.8W at your chosen operating voltage (12V or 24V DC).\"}}, {\"@type\": \"Question\", \"name\": \"What is the maximum current each relay can switch?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Each relay on this board is rated for a maximum of 20A. It supports load voltages up to 250VAC, 125VAC, 30VDC, 28VDC, and 12VDC, making it suitable for high-current AC and DC applications.\"}}, {\"@type\": \"Question\", \"name\": \"How do I reset the network settings to factory defaults?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"This board features a built-in network port factory reset function. You can restore factory settings directly through the network interface without needing to physically access or modify the board's hardware.\"}}]}\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\": \"32-Channel 20A Modbus Relay Board RS485 Ethernet DC 12V\/24V\", \"item\": \"https:\/\/kujrmc-0q.myshopify.com\/products\/32-channel-20a-modbus-relay-board-rs485-ethernet-tcp-ip-dc-12v-24v\"}]}\u003c\/script\u003e","brand":"Vue","offers":[{"title":"12V Network Port","offer_id":48747011539136,"sku":"5:200004182#12V Network Port","price":491.99,"currency_code":"USD","in_stock":true},{"title":"24V Network Port","offer_id":48747011571904,"sku":"5:200004183#24V Network Port","price":491.99,"currency_code":"USD","in_stock":true},{"title":"12V Only RS485","offer_id":48747011604672,"sku":"5:144170022#12V Only RS485","price":491.99,"currency_code":"USD","in_stock":true},{"title":"24V Only RS485","offer_id":48747011637440,"sku":"5:200004763#24V Only RS485","price":491.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0772\/9338\/7968\/files\/Se5608f5c9b164fb28657b0dc764cbba0e.webp?v=1786196992","url":"https:\/\/vueselect.com\/products\/32-channel-20a-modbus-relay-board-rs485-ethernet-tcp-ip-dc-12v-24v","provider":"Vue","version":"1.0","type":"link"}