The Honeywell 51202902-300 appears to be a RAM charger assembly for the S8 C300 controller module. It provides memory backup power for the controller, ensuring that the program memory is preserved even if the main power is lost.

Here’s what I could find about its technical specifications

• Function: Memory backup for S8 C300 controllers
• Supports: Up to 4 physical S8 C300 controllers

Additional features

• May require multiple units depending on system cabinet design and number of controllers
• Specific technical details like voltage, current, and power consumption are not readily available