DIN-Rail PCF8574 I2C 12V 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 holder.
• This board uses 4-pin, 2.00mm pin pitch 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: 2.5Vdc - 5.5Vdc with reverse polarity protection
• Relay power supply voltage: 9Vdc - 13Vdc with reverse polarity protection (12Vdc recommended)
  
• Relay contact rating: 10A @120Vac/24Vdc or 6A @250Vac rated for 100,000 life cycles
• Compatible with most microcontrollers
• PCB size: 87.50 x 72.00 mm

This is the second version of the I2C bus relay board, designed as a remote 8-relay expander for the I2C bus, based on the PCF8574. It is ideal for expanding relay outputs via I2C, and it is compatible with most microcontrollers.

The board supports a 100kHz I2C bus frequency. Addressing is done via 3 jumpers, allowing up to 8 boards (64 relays). Additionally, up to 16 boards (128 relays) can be connected when both PCF8574 and PCF8574A are used on the same bus.

The operating logic supply voltage is 2.5V DC - 5.5V DC, with inverse polarity protection.

The relay supply voltage is 9V DC - 13V DC, with inverse polarity protection (12V DC recommended). The relay contact rating is 10A @ 120V AC / 24V DC or 6A @ 250V AC, 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 turning on. Always turn off the power supply before connecting or disconnecting I2C cables.