We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Green Raspberry Pi relay board with dual fans and LED indicator

SMUGDESK

SMUGDESK Raspberry Pi Relay Expansion Module Dual Fans Auto LED

SKU CH-KR3Q-ENHAB

A relay expansion board with dual cooling fans and auto color-changing status LED for Raspberry Pi A+, 3A+, B+, 2B, 3B, 3B+ and 4B

  • Dual fans prevent thermal throttling during long tasks
  • Auto color LED shows status without software checks
  • Relay channels switch external loads for automation projects
  • Compatible with Pi A+, 3A+, B+, 2B, 3B, 3B+, 4B
  • Compact plug-and-play board simplifies wiring for development

Raspberry Pi Relay Expansion Module

This relay expansion module adds load-switching capability and active cooling to Raspberry Pi single-board computers from the A+, B+, 2B, 3B, 3B+ and 4B families. It integrates dual fans, a relay control unit and an auto-colour-changing status LED on one compact board. The unit is aimed at makers building smart-home, robotics or industrial-monitoring projects that need reliable external-load control.

Compatibility and Pin Clearance

Verify that your Raspberry Pi model appears in the supported list and that the 40-pin GPIO header is free for the board to sit directly on top. Ensure the enclosure or mounting hardware leaves enough space for the dual fans to draw air without obstruction. Confirm your power supply can deliver the combined current for the Pi, the fans and any driven loads.

Thermals, Noise and Power Draw

The built-in dual fans actively dissipate heat from the Raspberry Pi CPU during long-running tasks, reducing the risk of thermal throttling. Fan noise is present whenever the module is powered and increases with ambient temperature. The relay coils and fan motors draw additional current from the Pi's 5 V rail, so total system power consumption rises compared with a bare board.

Highlights

  • Dual fans prevent thermal throttling during long tasks
  • Auto color LED shows status without software checks
  • Relay channels switch external loads for automation projects
  • Compatible with Pi A+, 3A+, B+, 2B, 3B, 3B+, 4B
  • Compact plug-and-play board simplifies wiring for development

Specifications

No published specifications for this item yet.

Questions about this item

Does the SMUGDESK relay expansion module ship with the Raspberry Pi board and mounting hardware included?

The module is a standalone add-on board; the Raspberry Pi single-board computer and any mounting screws or standoffs must be purchased separately.

Which Raspberry Pi models does this relay board support and how do I pick the right one?

It is compatible with Raspberry Pi A+, 3A+, B+, 2B, 3B, 3B+ and 4B; choose the model you already own or plan to use, as the board fits all listed versions.

What does the auto colour-changing LED actually show when the module is running in my project?

The LED shifts colour automatically to reflect the module’s real-time operating status, letting you see at a glance whether the relays are active or if the fans are cooling the Pi.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.