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Green circuit board with two small fans and colour-changing LED, stacked on Raspberry Pi

SMUGDESK

SMUGDESK Power Relay Expansion Module for Raspberry Pi with Dual Cooling Fans & Auto Color Changing LED

SKU CH-Q69P-NPS5X

Adds dual-fan cooling and status LEDs to Raspberry Pi relay control for A+, 3A+, B+, 2B, 3B, 3B+ and 4B boards

  • Designed for Raspberry Pi A+, 3A+, B+, 2B, 3B, 3B+, 4B
  • Dual cooling fans maintain low temperature during continuous relay operation
  • Auto colour-changing LED shows module status at a glance
  • Reliable relay outputs switch external loads for automation projects
  • Compact stackable design fits directly onto Pi GPIO header

Raspberry Pi Relay Expansion Board

The SMUGDESK module adds four relay channels to Raspberry Pi A+, 3A+, B+, 2B, 3B, 3B+ and 4B models. It is designed for makers, students and engineers who need to switch external loads in home automation, experimental rigs or small industrial control projects.

Dual Fans and Status LED

Two onboard cooling fans actively remove heat generated during prolonged or high-current relay operation, protecting the board and extending its service life. An auto colour-changing LED displays the current working state at a glance, removing the need for extra diagnostic tools during development.

GPIO Header and Power Budget

The board stacks directly onto the Pi 40-pin header, so verify that your enclosure provides enough vertical clearance for the fans and relay housings. Confirm that your Pi power supply can deliver the additional current drawn by the fans and any connected loads before ordering.

Highlights

  • Designed for Raspberry Pi A+, 3A+, B+, 2B, 3B, 3B+, 4B
  • Dual cooling fans maintain low temperature during continuous relay operation
  • Auto colour-changing LED shows module status at a glance
  • Reliable relay outputs switch external loads for automation projects
  • Compact stackable design fits directly onto Pi GPIO header

Specifications

No published specifications for this item yet.

Questions about this item

Will the relay contacts need replacement after a certain number of switching cycles?

The mechanical relay contacts are rated for typical switching lifetimes; heavy inductive loads will wear them faster, so plan to swap the board after extended high-cycle use.

What limits how many relays I can keep energised at once?

The combined coil current of all active relays plus the dual fans draws from the Pi 5 V rail; exceeding the Pi supply rating is the first constraint under sustained operation.

How loud are the dual fans and how hot does the board get when running all day?

Two small fans produce a quiet, constant whir; they keep the PCB noticeably cooler than a fanless relay board during continuous load switching.

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