DIN-Rail PCF8574A I2C 24V 10A Relay Board

Discontinued product, the replacement product is I2C-RL824MV2.

*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)
• bom (.pdf)
• PCF8574 Datasheet (.pdf)
• Relay Datasheet (.pdf)
• 3D Models (.step)

*If your browser cannot display the PDF file properly, please save it to your computer and open it with a PDF reader.

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 PCF8574A
• 100kHz, I2C bus frequency
• Addressable via 3 jumpers, supports up to 8 boards(64 relays) or 16 boards(128 relays)
• Operating power supply voltage: 2.5-5.5Vdc with Reverse polarity protection
• Relay power supply voltage: 18-25Vdc 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 dimension: 87.50 x 72.00 mm

This is an I2C relay board designed as a remote 8-relay expander for the I2C bus, based on the PCF8574A. It is ideal for expanding relay outputs via the I2C bus and is compatible with most microcontrollers. The board supports a 100kHz I2C bus frequency and allows addressing via three jumpers, enabling the use of up to 8 boards (controlling 64 relays). Additionally, up to 16 boards (controlling 128 relays) can be connected—refer to the board's datasheet for more details.

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