The Allen Bradley AB 120V AC Power Supply Module 1771-P4S /B is a reliable unit designed for industrial automation systems. Made by Allen-Bradley in the United States, this power supply module is a single unit with a specific model number of 1771-P4S. It is a crucial component for PLCs and HMI systems, providing power supply for various industrial automation applications. This module is known for its quality and durability, making it a sought-after product in the realm of industrial automation and motion controls.