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The Allen-Bradley 150-A24NBDD is a versatile smart motor controller from the SMC series, designed for efficient energy management and scalability with an input power range of 200-480V AC and a 21 Amp rating. It features three standard operating modes: soft start, full voltage start, and current limit start, making it ideal for managing resistive loads. The unit simplifies installation with an electromechanical motor starter that eliminates additional control wiring and offers optional smart motor braking for enhanced functionality. Its protective design includes metal oxide varistors to guard against electrical surges, while an inbuilt energy saver optimizes performance during light or unloaded conditions. Configured with rotary digital and DIP switches, it can function with or without a motor starter, and its LED indicators provide clear operational feedback.