4-Channel Industrial Modbus RTU Relay Module – 30A, RS485, LED Indicators, Rail-Mount
The Waveshare Modbus RTU 4-Channel Relay Module provides reliable high-current switching for industrial automation over an RS485 bus. Each of the four SPDT relays handles loads up to 30A at 250VAC or 28VDC, making it suitable for controlling motors, lighting, HVAC systems, and other heavy-duty equipment.
Communication uses the standard Modbus RTU protocol with configurable device addresses (1–255), allowing multiple modules to be cascaded on a single RS485 bus. The module includes multi-isolation protection with ADI magnetic isolation, resettable fuse, and TVS diode to ensure stable operation in electrically noisy environments.
Key Features
- 30A High-Current Relays – 4× SPDT relays (1NO + 1NC each), rated ≤30A at 250VAC or ≤30A at 28VDC
- Standard Modbus RTU Protocol – Widely supported communication protocol for seamless integration with PLCs, HMIs, and SCADA systems
- Configurable RS485 Addressing – Set unique addresses from 1 to 255 for cascading multiple modules on one bus
- Multi-Isolation Protection – ADI magnetic isolation, resettable fuse, and TVS diode guard against electrical disturbances
- Wide Supply Voltage – Operates from 7V to 36V DC with built-in voltage regulation
- Automatic Flash Control – Program relays to turn on and off for a set period automatically
- LED Status Indicators – Monitor MCU status, data transmission, and reception at a glance
- DIN Rail Mounting – Industrial-grade ABS enclosure with rail-mount design for easy panel installation
Specifications
- Power Supply – 7–36V DC
- Standby Power – ~0.4W (all relays off at 12V)
- Active Power – ~4.9W (all relays on at 12V)
- Communication Interface – RS485
- Baud Rate Options – 4800, 9600, 19200, 38400, 57600, 115200, 128000, 256000 bps
- Default Format – 9600 bps, N, 8, 1
- Relay Channels – 4
- Contact Form – SPDT (1NO + 1NC per channel)
- Contact Rating – ≤30A 250VAC / ≤30A 28VDC
- Device Address Range – 1–255
- Protocol – Modbus RTU
- Dimensions – 145 × 90 × 40mm
- Weight – 278g
Ideal For
- Industrial automation and process control
- Building management and HVAC systems
- Home Assistant and smart home integration
- High-power machinery and lighting control
- PLC and SCADA system expansion
Package Contents
- 1× Modbus RTU 4-Channel Relay Module
Resources
Original: $48.00
-70%$48.00
$14.40Product Information
Product Information
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Shipping & Returns
Description
The Waveshare Modbus RTU 4-Channel Relay Module provides reliable high-current switching for industrial automation over an RS485 bus. Each of the four SPDT relays handles loads up to 30A at 250VAC or 28VDC, making it suitable for controlling motors, lighting, HVAC systems, and other heavy-duty equipment.
Communication uses the standard Modbus RTU protocol with configurable device addresses (1–255), allowing multiple modules to be cascaded on a single RS485 bus. The module includes multi-isolation protection with ADI magnetic isolation, resettable fuse, and TVS diode to ensure stable operation in electrically noisy environments.
Key Features
- 30A High-Current Relays – 4× SPDT relays (1NO + 1NC each), rated ≤30A at 250VAC or ≤30A at 28VDC
- Standard Modbus RTU Protocol – Widely supported communication protocol for seamless integration with PLCs, HMIs, and SCADA systems
- Configurable RS485 Addressing – Set unique addresses from 1 to 255 for cascading multiple modules on one bus
- Multi-Isolation Protection – ADI magnetic isolation, resettable fuse, and TVS diode guard against electrical disturbances
- Wide Supply Voltage – Operates from 7V to 36V DC with built-in voltage regulation
- Automatic Flash Control – Program relays to turn on and off for a set period automatically
- LED Status Indicators – Monitor MCU status, data transmission, and reception at a glance
- DIN Rail Mounting – Industrial-grade ABS enclosure with rail-mount design for easy panel installation
Specifications
- Power Supply – 7–36V DC
- Standby Power – ~0.4W (all relays off at 12V)
- Active Power – ~4.9W (all relays on at 12V)
- Communication Interface – RS485
- Baud Rate Options – 4800, 9600, 19200, 38400, 57600, 115200, 128000, 256000 bps
- Default Format – 9600 bps, N, 8, 1
- Relay Channels – 4
- Contact Form – SPDT (1NO + 1NC per channel)
- Contact Rating – ≤30A 250VAC / ≤30A 28VDC
- Device Address Range – 1–255
- Protocol – Modbus RTU
- Dimensions – 145 × 90 × 40mm
- Weight – 278g
Ideal For
- Industrial automation and process control
- Building management and HVAC systems
- Home Assistant and smart home integration
- High-power machinery and lighting control
- PLC and SCADA system expansion
Package Contents
- 1× Modbus RTU 4-Channel Relay Module
