Allen-Bradley 1756-PA72 NSNBC01 Power Supply

The Allen-Bradley 1756-PA72 NSNBC01 Power Supply is a ControlLogix AC-input chassis power unit that provides a 5 V DC rail to the 1756 backplane with a current capability up to 10 A to support installed modules. It accepts 85–265 VAC input and is designed to mount on the left side of a standard 1756 ControlLogix chassis, making it an integral part of the system’s power architecture. The unit delivers a 5 VDC output at up to 10 A to feed the backplane and connected I/O modules, ensuring stable operation of ControlLogix racks that rely on the 1756-series power distribution. Per installation guidelines, one 1756 chassis power supply is required for each 1756 chassis, underscoring its role in reliably powering all backplane circuits and modules within the enclosure. This model, identified by the NSNBC01 variant code, is part of Allen-Bradley’s ControlLogix power family and is commonly used in industrial automation applications that deploy 1756-series controllers and I/O modules in machine control and manufacturing environments.