Industrial Modbus RTU 4 Channel Relay Module with RS485 Interface 30A High Current Onboard LED Indicators Multi Isolation Protection Circuits Industrial Grade Rail Mount Case
The Industrial Modbus RTU 4-Channel Relay Module with RS485 interface is a high-current (30A) industrial control solution designed for reliable automation systems. Supporting standard Modbus RTU communication, it features configurable addresses (1–255) and cascade capability over RS485. With built-in power isolation, ADI magnetic isolation, optocoupler protection, resettable fuse, and TVS surge protection, it ensures stable and safe operation. Housed in a rail-mounted ABS enclosure, it is ideal for high-power industrial switching applications.
وحدة ريليه صناعية 4 قنوات بتيار عالي 30 أمبير تدعم بروتوكول Modbus RTU عبر واجهة RS485، مصممة لأنظمة التحكم الصناعية. تتيح ضبط العنوان من 1 إلى 255 مع إمكانية ربط عدة وحدات على نفس خط الاتصال. تحتوي على عزل كهربائي ومغناطيسي ADI وعزل ضوئي، مع فيوز قابل لإعادة الضبط وحماية TVS ضد الارتفاعات المفاجئة. تأتي بهيكل ABS قابل للتركيب على سكة DIN، ومناسبة للتطبيقات الصناعية ذات الأحمال العالية.
The Industrial Modbus RTU 4-Channel Relay Module is a high-performance industrial-grade relay controller designed for heavy-duty switching applications. Controlled via RS485 bus using the standard Modbus RTU protocol, it ensures stable, fast, and reliable communication with PLCs, HMIs, SCADA systems, and industrial automation platforms.
This module features four high-current relays rated up to 30A, making it suitable for controlling high-power AC or DC loads. It supports configurable device addresses from 1 to 255, allowing multiple modules to operate on the same RS485 bus network.
For enhanced reliability and safety, the module integrates multiple protection mechanisms, including onboard voltage regulation (7–36V input), power supply isolation, ADI magnetic isolation for signal protection, optocoupler isolation to prevent high-voltage interference, resettable fuse for over-current protection, and TVS diode suppression for surge and lightning protection. A reverse-proof circuit protects the board from accidental incorrect wiring.
The module also supports flash-on and flash-off timing functions via command parameters, enabling temporary relay activation without additional controllers.
Housed in a durable DIN rail-mounted ABS enclosure, it is easy to install and safe for industrial control cabinets.
Specifications
| Power supply | 7~36V |
|---|---|
| Communication interface | RS485 |
| Baudrate | 4800, 9600, 19200, 38400, 57600, 115200, 128000, 256000 |
| Default communication format | 9600, N, 8, 1 |
| Relay channels | 4 |
| Contact form | 1NO 1NC |
| contact rating | ≤30A 250V AC or ≤30A 28V DC |
| Communication protocol | Standard Modbus RTU protocol |
| RS485 address | 1~255 |
| LED indicators | STA: MCU indicator, keeps flashing when the MCU is normally working TXD: TX indicator, lights up when sending data RXD: RX indicator, lights up when receiving data |
Interfaces & Indicators
With Multiple LED Indicators, Easy To Monitor The Operating Status
High Current Screw Terminals
30A high current relay, Onboard high quality screw terminals with covers, more convenient for high current wiring
Hardware Analysis
Multiple protections for safer and more reliable use
Enclosure Design
Rail-mounted ABS plastic enclosure, easy to install, safe to use
RS485 Communication
Configurable device address (1~255), multi devices can be cascaded on RS485 bus
In case of many devices are cascaded, or communication distance is quite long, it is necessary to use RS485 repeaters
Relay connection
Contact rating of the onboard relay up to 30A 250V AC or 30A 28V DC
