Allen-Bradley 321155-A01 Precharge Circuit Board

The Allen-Bradley 321155-A01 Rev 03 5204 Precharge Circuit Board is a spare precharge PCB designed for use with Allen-Bradley 1336 drive systems. It provides the precharge function that sequences the DC bus capacitors before enabling the drive’s main power stage, helping to limit inrush and protect downstream electronics. This board is commonly referenced in conjunction with the 1336-PB-SP2E precharge assembly family, making it a direct replacement option for 1336-series drives that require a dedicated precharge module. The part number 321155-A01 and revision Rev 03 identify this board in the Allen-Bradley 1336 drive ecosystem, intended to be compatible with the same precharge role within the drive. When installed as a replacement, the 321155-A01 unit restores the drive’s safe precharge sequence without replacing the entire drive assembly, simplifying maintenance and reducing downtime for industrial automation systems that rely on 1336 controllers and AC drives. Typical applications include service and repair of Rockwell Automation 1336 drive assemblies in manufacturing, packaging, and process control environments where controlled DC bus precharging is required. Note: use only as a direct replacement for the specified part number and revision to preserve compatibility with the drive documentation.