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