Allen-Bradley 1746-P1 Rack Mount Power Supply

Allen-Bradley 1746-P1 Rack Mount Power Supply for SLC 500 modular systems converts AC line power into two DC rails to power the backplane and user devices in a 1746 rack. It accepts a universal AC input of 85–132 VAC or 170–265 VAC at 47–63 Hz, with a typical line power of about 135 VA and an inrush up to 20 A, and it uses 1746-F1 (or equivalent) fuse protection. Internally, the unit provides 5 V DC at up to 2 A to the 5 V/backplane circuitry and 24 V DC with an internal capability of 0.46 A, while offering a separate 24 V user-power rail up to 200 mA and a user-power voltage range of 18–30 V DC (typical 20.4–27.6 V). The 1746-P1 features 1800 V AC RMS isolation for 1 second (with corresponding DC isolation ratings) between primary and secondary, and it is rated for ambient operating temperatures from 0 to 60 °C with a 5% derating above 55 °C. Wiring guidance specifies #14 AWG is appropriate for connections, consistent with SLC 500 installation practices. This rack-mount power supply is designed specifically for the SLC 500 family (Bulletin 1746) to power both the backplane and user peripherals within a single chassis, supporting reliable operation of I/O modules and the controller in typical industrial environments.