Allen-Bradley 1775-P1 Power Supply

Allen-Bradley 1775-P1 Power Supply is a legacy DC power supply module designed for the PLC-3 family. It is a plug‑in power source for the PLC-3 rack, providing the necessary DC power to the logic circuitry that runs the system. The unit accepts 120/220 VAC input (47–63 Hz) and is rated 6/3 A, reflecting its capability to draw current from the line at the two common voltage standards of the era. This model is part of the PLC-3 expansion system, and its proper function is essential for reliable operation of the PLC-3 controllers and associated modules. The 1775-P1 is listed by multiple suppliers as the official power supply module for PLC-3 installations, and is commonly found in legacy industrial control panels that still rely on AB PLC-3 hardware. When installing, ensure the rack hardware supports PLC-3 power supplies and that the module is correctly seated in the backplane to maintain stable operation. Typical applications include retrofitting, maintenance, or spares for older Allen-Bradley control panels in manufacturing environments where PLC-3 remains in service.