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Green circuit board with three black relay modules and a 40-pin GPIO header

WaveShare

WaveShare 3-CH Relay Board for Raspberry Pi 40PIN GPIO

SKU CH-JBMH-6ZQXB

A three-channel relay board adds mains-voltage switching to any 40-pin Raspberry Pi, handling loads up to 5 A at 250 V AC or 30 V DC with opto-isolation and status LEDs

  • CPU TypeOther
  • Controls three independent circuits
  • Switches up to 5 A at 250 V AC or 30 V DC
  • Photo-isolation separates logic from mains voltage
  • On-board LEDs show each relay state
  • Jumper-selectable GPIO pins avoid conflicts

Three-Channel Relay Board

This expansion board adds three independent power relays to any Raspberry Pi with a 40-pin GPIO header. It is designed for makers and engineers who need to switch mains or low-voltage loads from a Pi-based project.

Suits Pi automation and IoT prototypes

Builders who need more than three switched circuits or require solid-state switching speeds should look at a different module. The board is not intended for high-frequency PWM control or loads beyond the stated relay ratings.

Simple GPIO header installation

The board plugs directly onto the 40-pin header without soldering. A jumper block lets you reassign control pins if the defaults conflict with other HATs. Mis-wiring high-voltage terminals is the most common error, so verify connections before applying power.

Highlights

  • Controls three independent circuits
  • Switches up to 5 A at 250 V AC or 30 V DC
  • Photo-isolation separates logic from mains voltage
  • On-board LEDs show each relay state
  • Jumper-selectable GPIO pins avoid conflicts

Specifications

CPU TypeOther

Questions about this item

Which Raspberry Pi models does this 40PIN GPIO relay board support?

It fits Raspberry Pi 4B, 3B+, 3B, 2B, A+ and B+ boards that have the standard 40PIN header.

Can I keep using the default GPIO pins for other hats while this board controls three relays?

Yes, the onboard relay control jumper lets you reassign the relay signals to custom pins instead of the defaults.

How do I confirm each of the three channels is switching correctly after wiring?

Watch the onboard status LEDs; each one lights when its relay coil is energised.

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