DIN-Rail PCF8574 I2C 24V 10A Relay Board V2

*The RoHS icon on this product indicates that the PCBs, components, solder, and chemicals are all lead-free and RoHS compliant. Additionally, this product is produced using a lead-free process. Unfortunately, we are currently unable to provide documentation confirming that this product is RoHS compliant.

Resources:

• User Manual (.pdf)
• Schematic (.pdf)
• PCF8574 Datasheet (.pdf)
• Relay Datasheet (.pdf)
• 3D Models (.step)

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Package Includes:

• 1x Board

This package does not include Din-Rail PCB holders and cables.

Notes:

• This package does not include Din-Rail PCB holders and cables.
• This board uses 4-pin connectors for I2C bus.

Features:

• 8 relays on board
• Based on PCF8574
• 100kHz I2C bus frequency
• Addressable via 3 jumpers, supporting up to 8 boards(64 relays) or 16 boards(128 relays)
• Operating power supply voltage: 2.5-5.5Vdc with reverse polarity protection for I2C power supply
• Relay power supply voltage: 18-25v with reverse polarity protection(24Vdc recommended)
• Relay contact rating 10A @120Vac/24Vdc or 6A @250Vac rated for 100,000 life cycles
• Compatible with most microcontrollers
• PCB dimenson: 87.50 x 72.00 mm

This is an I2C relay board, the 2nd version of the I2C-RL824M. It is designed as a remote 8-relay expander for the I2C bus, based on the PCF8574, making it ideal for expanding relay outputs via I2C. The board is compatible with most microcontrollers and supports a 100kHz I2C bus frequency.

The board can be addressed via 3 jumpers, allowing for up to 8 boards (64 relays). Additionally, up to 16 boards (128 relays) can be connected—refer to the board's datasheet for more details.

The operating logic supply voltage is 2.5V - 5.5V, with reverse polarity protection. The relay supply voltage ranges from 18V to 25V, with reverse polarity protection (24V recommended). Each relay has a contact rating of 10A @ 120V AC / 24V DC or 6A @ 250V AC, and is rated for 100,000 life cycles. The board also includes relay power-on protection.

⚠️ Important: To prevent damage to the board, do not plug or unplug I2C cables while the power supply is on. Always turn off the power supply before connecting or disconnecting I2C cables.