Allen-Bradley 1769-PA4 DC Power Supply Module

Allen-Bradley 1769-PA4 Compact I/O DC Power Supply Module accepts a switch-selectable 120/240 VAC input (85–265 VAC range) and provides a 5 V DC power bus rated to 4 A, plus a 24 V DC auxiliary rail up to 2 A for compatible devices in a 1769 Compact I/O rack. This power supply draws up to roughly 200 VA at 120 VAC or 240 VA at 240 VAC, and it features front-access short-circuit protection via a replaceable fuse (Wickmann 19195-3.15 A or 19181-4 A). Inrush current can reach up to 25 A at 132 V AC or 40 A at 265 V AC, enabling rapid energization of the rack. Isolation between input power and the 1769 bus is rated around 1836 V AC for 1 s (2596 V DC for 1 s) with a working voltage of 265 V, providing safety margins in industrial environments. The PA4 is UL 508, CSA Class I Division 2, and CE certified, reflecting compliance for use in commercial automation installations. The module is designed to power 1769 I/O modules and compatible CompactLogix controllers in a single rack, delivering a robust 5 V/4 A main supply with a 24 V/2 A auxiliary rail to support mixed‑voltage I/O and minimize external power provisioning.