The 1336-BDB-SP55D is an Allen Bradley manufactured drive board that fits into the G-frame. It is a printed circuit board gate drive, powered by an input supply of up to 575 Volts AC and an output of 650 Horsepower, and is additionally connected to a terminal block TB4 power input of 24 Volt DC. This spare part manufactured by Rockwell Automation replaces the obsolete part numbers 1336-BDB-SP55A and 1336-BDB-SP55C. The drive board series is engineered for use by Adjustable Frequency AC drives. The 1336-BDB-SP55D works with AC drives of different classes, such as 1336 PLUS, PLUS II, FORCE, IMPACT and regenerative frequency adjustable drives. The operating power capacity of this board is determined by the class and type of drive functions in and normally supports between 3 and 800 horsepower rating. It is in essence powered by the operating voltage of the frequency adjustable drive. The 1336-BDB-SP55D is positioned on the circuit board platform of the drive embedded in.

The Gate drive board is fitted with two fuses in the circuitry to guard against overcurrent where there is uneven distribution network of a power supply. The 1336-BDB-SP55D board is also connected to Ground Fault CT through the connector cable J2. It is mounted to the main control board by the use of 8 screws. Several other connectors are terminated on the PCB Gate Drive serving various purposes. Part replacement procedures provided by the manufacturer should be adhered to when unmounting and installing the board as some printed circuit board devices contain hazardous levels of voltage. The operator must wear wrist-type grounding strip and disconnect the drive from the power source before disassembly or assembly. Care should also be taken to protect the drive against damage from Electrostatic Discharge, ESD.