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Green rectangular circuit board with GPIO header and small cooling fan

WaveShare

WaveShare Power Over Ethernet HAT (D) with Cooling Fan for Raspberry Pi 4B/3B+

SKU CH-S7MY-AB7K0

Adds Power over Ethernet to Raspberry Pi 3B+ or 4B with an IEEE 802.3af-compliant HAT that supplies 5V 2.5A from a 37–57V input and includes a built-in cooling fan

  • CPU TypeOther
  • IEEE 802.3af-compliant PoE powers the Pi over a single Ethernet cable
  • Isolated switched-mode supply delivers 5 V at 2.5 A from 37–57 V DC input
  • Onboard high-speed fan actively cools the board for better heat dissipation
  • HAT fits Raspberry Pi 3B+ and 4B inside the official case
  • Fully isolated power design protects the Pi from voltage spikes

Power Over Ethernet HAT for Raspberry Pi 4B and 3B+

This HAT adds IEEE 802.3af-compliant Power over Ethernet to Raspberry Pi 4B and 3B+ boards. It accepts 37 V to 57 V DC from a PoE switch or injector and delivers a regulated 5 V 2.5 A supply to the Pi. The board fits inside the official Raspberry Pi case without modification. It is not for users who need PoE+ (802.3at) power levels or compatibility with earlier Pi models lacking the PoE header.

Isolated SMPS with 5 V 2.5 A output

The onboard fully isolated switched-mode power supply converts the PoE input to a clean 5 V rail rated at 2.5 A. This single specification decides whether the HAT can run your Pi plus attached peripherals under load. If your total 5 V draw exceeds 2.5 A you must supply power by another method. The module does not support 802.3at Class 4 power budgets.

Active cooling fan for sustained operation

A high-speed active cooling fan is integrated directly on the HAT to dissipate heat from the SMPS during continuous PoE operation. This keeps the power supply within safe thermal limits when the Pi runs at full load for extended periods. The fan draws power from the same 5 V rail, so the 2.5 A budget must cover both the Pi and the fan. It is not for silent, fanless deployments.

Highlights

  • IEEE 802.3af-compliant PoE powers the Pi over a single Ethernet cable
  • Isolated switched-mode supply delivers 5 V at 2.5 A from 37–57 V DC input
  • Onboard high-speed fan actively cools the board for better heat dissipation
  • HAT fits Raspberry Pi 3B+ and 4B inside the official case
  • Fully isolated power design protects the Pi from voltage spikes

Specifications

CPU TypeOther

Questions about this item

How much power can the HAT deliver to a Pi 4B or 3B+?

The HAT supplies 5 V at 2.5 A to the Raspberry Pi once it receives PoE input between 37 V and 57 V DC.

Which PoE standard does the HAT follow and what voltage range does it accept?

It complies with IEEE 802.3af and accepts a PoE input of 37 V to 57 V DC.

Will the HAT fit inside the official Raspberry Pi 4B or 3B+ case?

Yes, it is designed to be compatible with the official Raspberry Pi 4B and 3B+ cases.

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