This 4-channel relay module operates via RS-485 using the Modbus RTU protocol. It features high-current relays rated up to 30A at 250V AC or 28V DC and is built for applications requiring reliable switching and communication. The ABS DIN rail-mount case makes it easy to install in industrial environments.
The module includes multiple protection circuits such as power isolation, ADI magnetic signal isolation, a resettable fuse, and a TVS diode. It also includes optocoupler isolation to guard against interference from high-voltage circuits, as well as reverse-polarity protection. A dedicated relay driver chip with built-in flyback diode protection ensures consistent switching performance.
Power input supports a wide 7–36V DC input range via an onboard voltage regulator. A unibody isolation design provides stable voltage to the isolated terminal without requiring an additional supply. The relay supports flash-on/flash-off operation using command parameters, and each unit can be assigned an address from 1 to 255, allowing multiple devices to share the same RS-485 bus. Three onboard LEDs indicate MCU activity and RS-485 communication status. High-quality screw terminals with covers simplify wiring for high-current loads.
This product should be operated and used by professional electricians or technical personnel. During use, please ensure electrical safety and take protective measures such as anti-leakage and insulation.
Before installing, maintaining, or replacing relay equipment, make sure to turn off the power and unplug the device.
Do not attempt to dismantle relay equipment to avoid damaging the device or risking electric shock.
Please properly install and place the relay equipment. Avoid using it in damp, overly hot, or flammable environments to prevent safety accidents due to improper installation or use.
Features
Configurable device address (1–255); supports cascading on RS-485 bus
Flash-on/flash-off relay control via command with timing support
Wide input voltage range: 7V–36V DC
Integrated power supply isolation; no extra supply needed for isolated terminal
ADI magnetic isolation for reliable signal transmission and low interference
Resettable fuse and TVS diode for surge, overcurrent, and electrostatic protection
Optocoupler isolation to reduce high-voltage interference
Relay driver chip with flyback diode for stable operation
Reverse-polarity protection circuit
Relay contact rating: ≤30A at 250V AC or ≤30A at 28V DC
DIN rail-mount ABS enclosure
Three status LEDs for MCU activity and RS-485 communication
STA: MCU indicator, keeps flashing when MCU is working normally TXD: Transmit Data indicator, lights up when transmitting data RXD: Receive Data indicator, lights up when receiving data
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