The Three 40A/240V Relays RS485 Daisy-channable HAT is designed for use with the Raspberry Pi. It features three heavy-duty relays that can handle up to 40A and 240V each, suitable for controlling three-phase industrial loads. The card can be daisy-chained up to 32 units through an RS485 port and is equipped with pluggable connectors, an on-board processor, and LED indicators

It’s compatible with all Raspberry Pi versions from Zero to 5. The card requires a 12V power supply and includes reverse power supply protection, a reset push-button, DIN-Rail mounting brackets and screws. It also supports software self-test and comes with all necessary mounting hardware.

Features

• Three 40A/240V Relays RS485 Daisy-chainable HAT for Raspberry Pi
• Pluggable Connectors, 26-16 AWG wires for 12V power and RS485
• Daisy-chainable to 32 cards through RS485 port
• On-board processor
• Each relay can switch up to 40A and 240V
• Heavy duty, 40A/750V terminal block for output contacts
• RS485/MODBUS Port with TVS protection and dual connectors
• Reverse polarity power supply protection
• General purpose push-button
• LED indicators on each relay
• All mounting hardware included: stand-offs, screws and nuts
• DIN-Rail mounting clips included
• On-board resettable fuse
• Software self-test
• Three Relays for Raspberry Pi

Specifications

• Power Supply: 12V/8A pluggable connector with reverse polarity protection
• Contact Configuration: SPST-NO
• Contact Rating: 40A/277 VAC inductive load, 40A/VAC resistive load, 40A/30DC
• On/off time: 20ms max each
• Maximum Operating Frequency:
• Electrical Endurance: 600 cycles/hour, full load
• Mechanical Endurance: 18,000 cycles/hour, no load
• Electrical Life: 50,000 operations minim at 40A 277VAC
• Mechanical Life: 10,000,000 operations minimum, no load

Resources

• User’s Guide
• Open Source Hardware Schematic
• 2D CAD Drawing
• 3D STEP Model
• Command Line
• Python Library
• Node-RED nodes
• Relays Datasheet
• RoHS and REACH Compliance Declaration

Package Contents

• 1x 40A/240V RS485 add-on HAT for Raspberry Pi
• Mounting hardware
  • 4x M2.5x18mm male-female brass standoffs
  • 4x M2.5x5mm brass screws
  • 4x M2.5 brass nuts
• Connector Plugs
• DIN-Rail mounting brackets and screws