00:00Need reliable Modbus relay control without burning cash?
00:04Tested dozens of cheap boards, found 5 best Modbus relay boards under $18.43.
00:10These deliver rock-solid automation on tiny budget.
00:14First up, Fashion DC 24 V8 Channel Board at $16.48.
00:20Comes inside proper DIN 35 rail mount enclosure.
00:24Saves time printing brackets.
00:27Thousands sold, rated 4.6.
00:30Handles standard PLC cabinets cleanly.
00:33Solid buy if rail mounting matters most.
00:37Next, our 413D 088 Channel Board for flat $10.
00:41Absolute steel with 4.9 rating.
00:45Gives RS-485 plus TTL serial directly on board.
00:49Perfect for Arduino, ESP32, or Raspberry Pi integration.
00:54Zero fluff, just works.
00:57Best raw value here.
01:00Third, isolated Modbus board hitting exact $18.43 budget cap.
01:06Output rated 5A per channel.
01:08Crucial part, optical isolation protects master controller from nasty voltage spikes and inductive
01:14kickback.
01:15Also supports multiple interface options.
01:18Spend full budget here if equipment's safety priority.
01:21Fourth, FX2N Clone Industrial Control Board at $16.81.
01:28This not dumb relay board.
01:30Full programmable PLC core running Modbus RTU, 4.8 rating.
01:35Runs ladder logic standalone while taking Modbus commands.
01:39Buy this when local automation logic needed without PC connected.
01:44Fifth, lowest price pick, 8-channel RS-485 slash TTL module at $9.10.
01:51Has clear status LEDs per relay, wide voltage choices from 5V to 24V, 4.7 rating.
01:58Cheapest way to flip 8 physical switches over serial bus.
02:02Perfect for hobby builds on shoestring budget.
02:05All product links waiting in description below.
02:09Drop like, hit subscribe for more hardware tests.
02:13Leave questions in comments.
