AUTOMATIZA_LAB
See ranking
#31 in Industrial Control (B2B)
Waveshare 30-Channel Ethernet Relay Module — Modbus TCP/RTU, PoE
Industrial Control (B2B)

Waveshare 30-Channel Ethernet Relay Module — Modbus TCP/RTU, PoE

4.2(20 reviews)

$98.99reference price

View on Amazon

Best for

Industrial or building-automation installs that already have Ethernet wiring in place and prefer controlling relays over Modbus TCP instead of building a dedicated RS485 bus.

  • Ethernet
  • Modbus TCP
  • PoE
  • Waveshare

What is it and what's it for?

A 30-relay module controlled over Ethernet (Modbus TCP or RTU), with optional PoE power, for automating industrial loads from the building's existing data network.

Real-world use cases

At home

Not applicable — this is an industrial/B2B product meant for electrical panels and facility automation, not home use.

In a business or workshop

A plant or building with multiple loads to switch (warehouse lighting, pumps, ventilation) where Ethernet wiring already exists and running a separate RS485 bus is something to avoid.

How to avoid buying the wrong one

  • Ethernet control (Modbus TCP) instead of RS485 — leverages the building's already-installed network infrastructure.
  • Supports PoE power — a single network cable both powers and communicates with the module, no separate power supply needed.
  • Only 20 reviews — noticeably less market track record than this catalog's 16- and 32-channel RS485 modules.

The investment takeaway

Makes sense specifically when the install already has Ethernet and you want to avoid the extra wiring of an RS485 bus. If your install already uses RS485 or you prefer a product with a longer review history, this catalog's 16- or 32-channel Modbus RTU modules are the more proven pick.

Waveshare 30-Channel Ethernet Relay Module — Modbus TCP/RTU, PoE

$98.99reference price

See current price on Amazon

More products in this category

#1Waveshare RS232/485/422 to Ethernet Gateway (PoE)

Waveshare RS232/485/422 to Ethernet Gateway (PoE)

RS485/ModbusPoEDIN rail
4.2 · 120 reviews

Supports all three serial standards (RS232/485/422) on one device, so it works for both old instruments with an RS232 port and multi-device RS485 buses. PoE power is a real plus in installations where there's no outlet near the panel — a single Ethernet cable carries both data and power. Confirm whether your Modbus master needs TCP Server or Client mode before buying; the mode is set in software, it doesn't come fixed from the factory.

$36.99reference price

See current price on AmazonSee full buying guide
#2MOLLOM VFD 1.5kW (2HP) — Single-Phase to Three-Phase 220V

MOLLOM VFD 1.5kW (2HP) — Single-Phase to Three-Phase 220V

220V 1P→3P2HPCNC
4.1 · 31 reviews

Single-phase input to 220V three-phase output — the typical choice for workshops without a three-phase feed that want to run a 3-phase motor. This is an entry-level model (2HP/1.5kW), meant for spindles and small CNC motors, not large industrial loads. The output range up to 3000Hz is only useful if your specific spindle takes advantage of it — for a standard 60Hz motor it's irrelevant.

$89.99reference price

Check it out on AmazonSee full buying guide
#3VFD 4kW (5HP) Vector Control — 220V 1-Phase/3-Phase

VFD 4kW (5HP) Vector Control — 220V 1-Phase/3-Phase

Vector control5HP1P/3P
4.3 · 24 reviews

Has vector control (not just scalar V/F), which holds torque better at low RPM — important if you'll be threading or cutting at reduced speed. At 5HP/4kW it covers larger motors than the entry-level model, and accepts both single-phase and three-phase input, giving flexibility depending on the electrical setup available. Rated up to 26A — confirm your wiring and breakers can handle that current before installing.

$174.99reference price

Check availability on AmazonSee full buying guide
See the full ranking of Industrial Control (B2B) →