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Grey ABS plastic enclosure with eight relay modules and RS485 terminals

WaveShare

WaveShare Industrial Modbus RTU 8-ch Relay Module RS485 ABS Enclosure

SKU CH-K50P-0PMTZ

An 8-channel relay module with RS485 Modbus RTU control, 10 A 250 VAC contacts, isolation protection and a rail-mounted ABS enclosure

  • Modbus RTU address configurable 1 to 255 for multi-device RS485 cascading
  • Flash-on and flash-off timing lets relays auto-close after set duration
  • Unibody power and magnetic isolation removes need for extra isolated supply
  • TVS plus optocoupler protection guards against surges lightning and electrostatic discharge
  • 10A 250VAC 30VDC relay contacts in rail-mounted ABS enclosure with 3 LEDs

Industrial Modbus RTU 8-Channel Relay

The WaveShare module provides eight independently controlled relays on an RS485 bus using the Modbus RTU protocol. Each relay is rated for 10A at 250VAC or 30VDC, making it suitable for switching mains-level loads in automation cabinets. The board includes power-supply isolation, magnetic signal isolation, TVS surge suppression and optocoupler protection for reliable operation in electrically noisy environments. A rail-mounted ABS enclosure protects the circuitry and simplifies installation.

Addressing and wiring checklist

Before ordering, confirm that your controller or PLC supports Modbus RTU over RS485 and can address devices in the 1 to 255 range. Verify that the bus wiring uses twisted-pair cable with proper termination to avoid signal reflection. Ensure the load circuits do not exceed the 10A per contact rating and that the supply voltage for the coil side matches the module's requirements. The reverse-proof input connector guards against accidental polarity reversal during commissioning.

Thermal behaviour and power draw

The unibody isolated power supply and magnetic isolation keep internal dissipation low, so the enclosure remains cool during continuous operation. Three onboard LEDs indicate MCU status and bus activity without adding measurable heat. Optocoupler and TVS protection circuits clamp transients without drawing significant current, resulting in low overall power consumption. The ABS housing is rated for standard DIN-rail ambient temperatures and requires no forced airflow.

Highlights

  • Modbus RTU address configurable 1 to 255 for multi-device RS485 cascading
  • Flash-on and flash-off timing lets relays auto-close after set duration
  • Unibody power and magnetic isolation removes need for extra isolated supply
  • TVS plus optocoupler protection guards against surges lightning and electrostatic discharge
  • 10A 250VAC 30VDC relay contacts in rail-mounted ABS enclosure with 3 LEDs

Specifications

No published specifications for this item yet.

Questions about this item

What does the module include and what must be purchased separately?

The unit ships inside a rail-mounted ABS enclosure with three status LEDs and eight relays rated at 10A 250VAC/30VDC. Power supply and RS485 cabling are not included.

How do I choose the right Modbus address when several modules share one RS485 bus?

Each module can be set to any address from 1 to 255, so assign a unique number to every device on the bus to avoid conflicts.

What does the 10A 250VAC/30VDC relay rating mean in practice?

Each of the eight channels can switch loads up to 10 amps at 250 volts AC or 30 volts DC, suitable for typical industrial actuators and lighting circuits.

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