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Green circuit board with four black relay blocks and covered screw terminals inside a grey DIN-rail enclosure

V2 Technologies

V2 Technologies 4-Channel RS485 Relay Board 30A 7V-36V Modbus RTU 2 in 1 accessory

SKU CH-J8EF-Q5Y0G

Controls four high-current relays via RS485 Modbus RTU with 30A contacts, 7–36V supply, and cascadable addresses up to 255

  • Four relay channels controlled via RS485 Modbus RTU for industrial automation
  • 30A contact rating at 250V AC or 28V DC for high-power switching
  • 7V to 36V wide supply range with onboard regulator for flexible power
  • ADI magnetic isolation plus TVS diode and resettable fuse for robust protection
  • Configurable addresses 1 to 255 allow multiple boards on one bus

Industrial 4-Channel RS485 Relay Board

This industrial relay module provides four independently controlled channels via an RS485 bus using the Modbus RTU protocol. It is designed for automation engineers and system integrators building industrial control equipment that requires reliable, isolated switching. The board mounts on a standard DIN rail for secure installation inside cabinets.

30A contacts with 7V to 36V supply range

Each channel uses a high-quality relay rated for 30A at 250V AC or 30A at 28V DC, with screw terminals and protective covers for safe high-current wiring. The onboard voltage regulator accepts a wide 7V to 36V input, while integrated power isolation and ADI magnetic isolation protect the communication lines from interference. A resettable fuse and TVS diode add further circuit protection.

Upgrades basic relay modules lacking isolation

This board replaces simple relay boards that offer no bus communication or galvanic isolation, solving ground-loop and noise issues in industrial environments. The configurable address range of 1 to 255 allows up to 255 units on a single RS485 bus, removing the need for multiple controller ports. It is not suited for applications requiring Ethernet-based protocols or wireless control.

How it compares

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Price $66.99
Pricier than about 59% of the 7,473 comparable items (median $56.99).

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Specifications

No published specifications for this item yet.

Questions about this item

Can I connect this 4-channel RS485 relay board to an existing Modbus RTU network that uses device addresses above 255?

The board supports configurable device addresses from 1 to 255, so it can join any Modbus RTU network using addresses within that range. Multiple boards can be cascaded on the same RS485 bus.

How do I verify the relays are switching correctly after wiring the screw terminals?

Use the flash-on and flash-off function via Modbus RTU commands to pulse each relay for a set duration; the onboard isolation and protection circuits will operate normally during the test.

Does the package include a 7 V to 36 V power supply or RS485 cabling for the screw terminals?

The board has an onboard voltage regulator that accepts 7 V to 36 V directly through its screw terminals, so no separate isolated power supply is needed; RS485 wiring and the DC source are user-supplied.

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