The 1769-PB4 is a high-capacity DC expansion power supply designed for the Allen-Bradley Compact I/O and CompactLogix platform. This module is engineered to provide regulated backplane power for I/O banks that exceed the current capacity of the controller's integrated power source or for remote I/O configurations. It converts a nominal 24V DC input into the specific 5V DC and 24V DC voltages required by internal module circuitry.
With a robust 4.0 A current capacity at 5V DC, the 1769-PB4 is critical for maintaining system stability in high-density I/O racks. It supports up to eight modules within a single bank, providing reinforced isolation and integrated circuit protection to safeguard sensitive processor and communication components from input voltage fluctuations and field-side transients.
The 1769-PB4 offers industry-standard protection features and specific current derating curves to ensure reliable operation in demanding environments.
Manufacturer: Allen-Bradley / Rockwell Automation
Model/Part Number: 1769-PB4
Module Type: DC Power Supply Module
Input Voltage: 24V DC (Nominal)
Input Voltage Range: 19.2–31.2V DC
Power Consumption: 100 VA @ 24V DC
Output Current Capacity (5V DC): 4.0 A
Output Current Capacity (24V DC): 2.0 A
Inrush Current (Max): 30 A @ 31.2V DC
Power Dissipation: 14.5 W @ 60 °C
Isolation Voltage: 75V (continuous), tested at 1697V DC for 1 second
Fuse Types: Wickmann 19193-6.3A or Littelfuse 021706.3MXP
Power Supply Distance Rating: 8 Modules
Operating Shock: 20G
Wire Size: 22–14 AWG (Solid) or 22–16 AWG (Stranded) copper wire rated for 90 °C
Dimensions: 11.8 x 5.25 x 8.7 cm
Weight: 0.94 lbs (0.43 kg)
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