Allen-Bradley 1336-PB-SP2C 74101-502-57 Precharge Circuit Board for 1336 Series Drives

Product Overview

The Allen-Bradley 1336-PB-SP2C 74101-502-57 is a precharge circuit board designed exclusively for use with Allen-Bradley 1336 series variable frequency drives. As a specialized internal component within the 1336-PB-SP2C architecture, this precharge PCB manages the initial power-up sequence of the drive, limiting inrush current during capacitor charging to protect the drive’s power electronics from damage caused by excessive current surges.

The 74101-502-57 board is specifically configured for 1336F drives operating at 480V AC with J-frame construction, supporting drive ratings from 60 to 600 horsepower . This wide horsepower range reflects the precharge board’s role as a critical protective component in high-power industrial drive systems where uncontrolled capacitor charging could cause significant equipment damage. The Allen-Bradley 1336-PB-SP2C is installed alongside the drive’s main control board and receives power through jumper connectors from the mainboard, with mounting screws securing it in position within the drive chassis .

A status LED indicator on the 1336-PB-SP2C 74101-502-57 provides visual confirmation that the board is receiving power. The board features input and output connections for interfacing with the drive’s main control board, ensuring coordinated operation during the precharge sequence and normal drive operation . The 74101-502-57 is certified to cUL and CE standards, confirming compliance with North American and European safety and electromagnetic compatibility requirements . As a discontinued legacy component, the Allen-Bradley 1336-PB-SP2C remains available through surplus and refurbished industrial automation channels for maintenance of existing 1336 drive installations.

Technical Specifications