8-Channel Modbus RTU Latching Relay Module (C) with RS-485 Interface

This 8-channel latching relay module (C) is controlled via RS-485 and uses the Modbus RTU protocol. It features latching relays, meaning the relay states are retained even after power loss– ideal for applications where maintaining output state during outages is important. Housed in a DIN rail-mount ABS enclosure, it’s built for quick installation in control cabinets or industrial setups.

Each relay is rated for up to 10A at 250VAC or 30VDC. A dedicated driver chip provides reliable switching, and the flash-on/flash-off function allows relays to activate briefly and then return to their previous state, based on command parameters. The module supports configurable device addresses from 1 to 255 and can be cascaded with multiple units over the RS-485 bus(for longer distances or larger setups, RS-485 repeaters may be needed).

Built-in protection includes unibody power and magnetic isolation, TVS diodes, and a resettable fuse. These help protect against surges, interference, and incorrect wiring. A reverse-proof circuit prevents damage from accidental polarity errors. Three onboard LEDs indicate MCU operation and RS-485 signal transmission.

Note: Power adapter not included(12V DC Barrel Jack supply recommended).

Electrical Safety Precautions

• 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

• Latching relay retains state after power loss
• Configurable device address (1255); supports cascading on RS-485 bus
• Flash-on/flash-off relay control with timing via command
• Integrated power supply isolation; no separate supply needed for isolated terminal
• Magnetic signal isolation for high reliability and low interference
• Resettable fuse and TVS diode for surge, overcurrent, and electrostatic protection
• Dedicated latching relay driver chip for stable switching
• Reverse-polarity protection circuit
• Relay contact rating: 10A at 250VAC or 30VDC
• DIN rail-mount ABS enclosure
• Three LEDs for MCU and RS-485 status indication

Specifications

Resources

• Product Wiki

Package Contents

• 1x 8-Channel Modbus RTU Latching Relay Module (C) with RS-485 Interface

Power supply not included.