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The Allen-Bradley 1336S-MCB-SP2A is a vital main circuit board specifically engineered for 1336 PLUS Adjustable Frequency AC Drives, tailored for "A" frame sizes ranging from 0.37 to 7.5 kW (0.5 to 10 HP). Notably, it is positioned in the lower section of the drive, featuring 18 connecting pins which facilitate essential control and signal exchanges for operations such as analog input and output, external speed reference via a potentiometer, and pulse input for frequency reference. Furthermore, the board includes programmable relay contacts for critical functions such as fault, alarm, or run signals, complemented by an indicator LED to display status changes.