The 1769-PB4 from Allen‑Bradley is a high-capacity DC power supply designed for demanding CompactLogix I/O systems. This module converts a nominal 24V DC input into stable 5V and 24V DC outputs, providing 4.0A at 5V DC and 2.0A at 24V DC to support power-hungry I/O configurations. Compared to lower-current models, the 1769-PB4 offers double the output capacity, making it suitable for systems with many analog modules or devices that draw significant current. Furthermore, this unit supports bidirectional power distribution, enabling you to install up to eight modules on each side for a total of 16 modules. Its robust design includes reinforced insulation and comprehensive immunity to electrical noise, ensuring reliable operation in harsh industrial environments.
The 1769-PB4 operates on a DC input voltage range of 19.2 to 31.2V DC, with a nominal rating of 24V DC. This wide range accommodates battery-backed supplies and rectified DC sources commonly found in industrial facilities. The module consumes approximately 100VA at 24V DC and dissipates 14.5W of heat at 60 °C. During startup, it handles an inrush current of up to 30A at 31.2V DC, so you should size your upstream protection devices accordingly. The continuous isolation voltage is rated at 75V, with reinforced insulation per IEC Class 1 requirements. Additionally, the unit undergoes routine testing at 1697V DC for 1 second between the DC input and the system.
This power supply provides substantial output current: 4.0A at 5V DC and 2.0A at 24V DC to the CompactLogix backplane. The 5V output powers logic circuits, while the 24V output drives field-side devices and output channels. This higher capacity allows you to populate more modules or use power-intensive analog and specialty modules without worrying about overloading the supply. For instance, systems with multiple analog input modules or communication adapters benefit significantly from the extra headroom offered by the 1769-PB4.
The 1769-PB4 features a power supply distance rating of 8, meaning you can connect eight (8) 1769-series I/O modules on each side of the power supply. Consequently, a single unit can support up to 16 modules in total. This rating counts modules in both directions, giving you excellent layout flexibility. For example, you can place the processor and communication modules on one side while grouping analog and digital I/O on the other side to optimize signal routing and reduce wiring complexity.
An internal fuse protects the 1769-PB4 against overcurrent and short-circuit faults. Compatible replacement fuses include the Littelfuse 021706.3MXP and the Wickmann 19193-6.3A. This built-in protection safeguards both the power supply and the connected I/O modules from damage due to abnormal line transients. The module also features comprehensive electromagnetic immunity, including radiated RF immunity of 10 V/m across multiple frequency ranges and EFT/B immunity of ±2 kV at 5 kHz on DC power ports.
The 1769-PB4 measures approximately 118 mm x 70 mm x 87 mm (4.65 x 2.76 x 3.43 inches), with the height reaching 138 mm (5.43 inches) when including the mounting tabs. Weighing 630 g (1.39 lb) , it is slightly heavier than lower-capacity models due to the larger internal components. The shipping weight is about 2 pounds. Its compact footprint ensures efficient use of panel space while delivering high power output.
The 1769-PB4 has an open-style enclosure, so you must install it inside a protective control cabinet. Maintain a minimum clearance of 50 mm (2 inches) from adjacent equipment to ensure proper airflow and heat dissipation. The operating temperature range is 0 to 60 °C (32 to 140 °F) , while storage temperatures span from -40 to 85 °C (-40 to 185 °F). Moreover, the unit handles non-condensing relative humidity from 5% to 95%, making it suitable for most indoor industrial settings. It withstands operating vibration of 5G at 10 to 500 Hz. Importantly, the operating shock rating depends on the mounting method: 20G for DIN-rail mounting and 30G for panel mounting. Non-operating shock ratings are 30G for DIN-rail and 40G for panel mounting. The maximum operating altitude is 2000 meters (6562 feet).
Mounting the 1769-PB4 is flexible, as it supports both DIN-rail and panel mounting. Begin by securing the module in your chosen location while maintaining the 50 mm clearance requirement. For panel mounting, use the integrated mounting tabs with appropriate screws. For DIN-rail mounting, the pre-attached clip allows quick installation. Next, connect the 24V DC input wiring using 14 AWG (2.5 mm²) solid copper wire rated for 90 °C or higher with a maximum insulation thickness of 1.2 mm (3/64 in.). Keep wire leads short to minimize voltage drops and electromagnetic interference. The terminal block is clearly marked for polarity, so verify connections before applying power. Additionally, connect the ground terminal to a reliable earth ground using the same gauge wire. Once wiring is complete, attach I/O modules on both sides, respecting the distance rating. Finally, power up the system and check that the status indicators illuminate properly.
One (1) Allen-Bradley 1769-PB4 DC Power Supply module
One (1) removable terminal block for DC input connections
DIN-rail mounting clip (pre-installed)
Installation instruction sheet
Note: DC power cables, fuses, and additional mounting hardware are sold separately.
All orders are shipped via FedEx, UPS, or DHL with full tracking services. Each unit is packaged in anti-static materials to prevent electrostatic discharge damage during transit. Orders typically process within 1-2 business days. Expedited shipping options are available upon request for urgent projects.
1. What is the output current capacity of the 1769-PB4?
The 1769-PB4 delivers 4.0A at 5V DC and 2.0A at 24V DC. This is double the capacity of standard models like the 1769-PB2.
2. How many I/O modules can this power supply support?
You can connect up to eight (8) modules on each side, totaling 16 modules. This is based on the power supply distance rating of 8.
3. What fuse types are compatible with the 1769-PB4?
Compatible fuses include the Littelfuse 021706.3MXP and the Wickmann 19193-6.3A. These protect against overcurrent and short-circuit conditions.
4. Can I mount this power supply on a panel or DIN rail?
Yes, the 1769-PB4 supports both panel mounting (using the integrated tabs) and DIN-rail mounting (using the pre-attached clip).
5. What is the power dissipation of this module?
The 1769-PB4 dissipates approximately 14.5W at 60 °C. This value is important for calculating heat load and sizing cooling equipment for your enclosure.
| Brand Name | |
| Model No. | 1769-PB4 |
| Product Type | I/O Power Supply |
| hasMerchantReturnPolicy | Adjust according to reality |
| Shippingdetails | Adjust according to reality |
