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Green ABS rail-mounted case with eight relay modules and RS485 terminals

WaveShare

WaveShare 8-ch Modbus RTU Relay Module (E) RS485 30A 250V

SKU CH-A82G-NRW40

Eight-channel RS485 relay module switches 30 A at 250 V AC with optocoupler isolation, TVS surge protection and rail-mount enclosure

  • 8 independently addressable relays on one RS485 bus
  • 30 A 250 V AC contacts switch heavy industrial loads
  • 7 V–36 V supply with isolated regulator needs no extra power
  • Optocoupler, TVS and resettable fuse protect against surges and miswiring
  • Rail-mount ABS enclosure fits standard DIN installations

8-channel Modbus RTU relay module

The WaveShare 8-ch Modbus RTU Relay Module (E) is an industrial control unit that switches up to eight independent circuits over an RS485 bus. Each channel uses a high-quality relay rated for 30A at 250V AC or 30A at 28V DC. The module accepts a 7V to 36V supply and includes onboard voltage regulation with power-supply isolation. It mounts on a standard DIN rail inside a rail-mounted ABS plastic enclosure.

Installers needing cascaded RS485 switching

This module suits installers who need multiple relay banks on a single RS485 line because the device address is configurable up to 1255 and units can be cascaded. It also fits projects that require timed activation via the flash-on and flash-off command function. Buyers who need more than eight channels per unit or a different fieldbus protocol should look at other products.

30A 250V AC contact rating

The decisive specification is the relay contact rating of 30A at 250V AC and 30A at 28V DC. This current capacity determines whether the module can switch your specific loads such as heaters, motors or lighting circuits. Verify that your application stays within these limits before purchase.

Highlights

  • 8 independently addressable relays on one RS485 bus
  • 30 A 250 V AC contacts switch heavy industrial loads
  • 7 V–36 V supply with isolated regulator needs no extra power
  • Optocoupler, TVS and resettable fuse protect against surges and miswiring
  • Rail-mount ABS enclosure fits standard DIN installations

Specifications

No published specifications for this item yet.

Questions about this item

Should I choose this 8-channel relay module or a smaller version?

This module provides eight independent relay channels, each rated at 30A 250V AC or 30A 28V DC, so you can switch up to eight separate loads from a single RS485 bus address.

What does the 30A 250V rating mean when I wire it into my cabinet?

Each relay contact can continuously carry 30 amps at up to 250 volts AC, or 30 amps at 28 volts DC, allowing direct control of heaters, motors or lighting circuits within those limits.

How does the RS485 Modbus RTU interface limit the number of modules I can daisy-chain?

The module supports a configurable device address up to 1255, so you can cascade many units on one RS485 line; the practical limit is set by the Modbus address space and bus loading, not by the module itself.

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