Allen-Bradley 1768-PB3 Power Supply 24 Volt DC

Allen-Bradley 1768-PB3 CompactLogix Power Supply is a single-input 24V DC power source designed to feed the CompactLogix backplane. It accepts 16.8–31.2V DC input and provides a regulated 24V DC backplane supply capable of delivering up to 3.5A to connected modules, with no 24V output to a user-accessible terminal block. This open-style module has a 24V DC external power terminal for the input connection and is compatible with 1768-series controllers, serving as the DC-power front end in small-to-mid-size automation applications. Efficiency is rated around 80% typical at 24V DC, with a maximum input power of 112W and up to 22W of power dissipation. The PB3 includes protection characteristics typical for Rockwell power supplies, including up to 50A inrush current at turn-on and isolation of 250V reinforced between input and system (24V AUX) with 150V basic insulation between 24V AUX and system; it is designed as open-style (no enclosure). The 1768-PB3 complements the 1768-PA3 dual-input supply, delivering a compact, reliable DC power option for CompactLogix L4x systems where only a DC source is available, ensuring stable backplane power for the controller and I/O modules in industrial environments.