Allen-Bradley 1768-PB3
Allen-Bradley 1768-PB3
Allen-Bradley 1768-PB3
Allen-Bradley 1768-PB3
Allen-Bradley 1768-PB3
Allen-Bradley 1768-PB3
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1768-PB3

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The Allen-Bradley 1768-PB3 is a CompactLogix L4x DC input power supply that delivers stable 24V DC distribution to controllers and I/O modules while supporting reliable operation during brief power interruptions.
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Technical specifications for 1768-PB3

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1768-PB3
  • Product Family:
    CompactLogix
  • Product Type:
    CompactLogix L4x DC In Power Supply
  • Stock:
    1
  • Input voltage range:
    16.8...31.2V DC
  • Input voltage, nom:
    24V DC
  • Input frequency range:
    DC
  • Input power, max:
    112 W
  • Output power:
    max 90 W, min 6 W
  • Power dissipation:
    22 W
  • Inrush current, max:
    50 A @ 16.8...31.2V DC
  • Isolation voltage:
    250V
  • Internal overcurrent protection:
    Non-replaceable fuse is soldered in place
  • Recommended external overcurrent protection:
    8...12 A @ 166...250 A2S
  • Overcurrent protection:
    15 A, user supplied
  • Module location:
    DIN rail or panel mount
  • Mounting screw torque:
    1.16 N•m (10 lb•in) - use M4 or #8 screws
  • Wire category:
    1 - on power ports
  • Conductor screw torque:
    0.6 N•m (5 lb•in)
  • North American temperature code:
    T4
  • Ride-through interval time, min:
    5 ms @ 90 W
  • Full power hold-up interval:
    5 ms @ 90 W
  • Extended hold-up interval:
    8...12 s @ 1.25 W
  • Voltage:
    18...27.60V @ front panel
  • Output disable:
    Disable output during hold-up periods
  • Temperature, operating:
    0 °C< Ta < 60 °C (32 °F< Ta < 140 °F)
  • Temperature, nonoperating:
    -40…+85 °C (-40…+185 °F)
  • Relative humidity:
    5…95% noncondensing
  • Vibration:
    5 g at 10…500 Hz
  • Weight:
    1.3 kg
  • Estimated shipping dimensions:
    23.6x21.7x20.6cm
  • Tariff Code:
    8480719090
  • Country of origin:
    USA
  • Place of shipment:
    Xiamen, Fujian, China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

More Information

Overview Manuals Specifications Compatibility Protection Use Cases

Features:

  • Delivers stable 24V DC backplane power with up to 90 W output for CompactLogix systems.
  • Supports reliable operation during short power interruptions with integrated ride-through capability.
  • Provides flexible installation with DIN rail or panel mounting and integrated backplane distribution.
The Allen-Bradley 1768-PB3 plays a critical role in CompactLogix automation systems by supplying regulated DC power to controllers and I/O modules. Its ability to handle a wide input range from 16.8 to 31.2V DC allows it to adapt to various industrial power environments. With integrated backplane distribution, the unit ensures consistent delivery of both 5V and 24V power across connected modules. This structure simplifies system design while maintaining electrical stability. In industrial automation, consistent power is essential, and this module supports uninterrupted control processes. The design also aligns with standard control cabinet configurations, making integration straightforward.

In terms of functionality, the Allen-Bradley 1768-PB3 enables efficient energy conversion and distribution within the CompactLogix platform. The controller converts supplied 24V DC into the required voltage levels for system components, ensuring optimized operation. The module also includes an external 24V DC terminal, allowing additional field devices to be powered when needed. Its internal protection and recommended external safeguards contribute to system safety and longevity. With defined current limits of 3.5 A on the backplane and 0.25 A externally, the module maintains controlled and predictable power flow. These features make it suitable for both new installations and system expansions.

From an application perspective, the Allen-Bradley 1768-PB3 is well-suited for manufacturing lines, process control systems, and automation environments requiring dependable power infrastructure. Its vibration tolerance and wide operating temperature range ensure performance stability in harsh industrial conditions. The module’s ride-through and hold-up capabilities help prevent system shutdowns during brief power disturbances, improving overall uptime. Installation flexibility further enhances its usability across different panel configurations. By supporting both legacy and modern CompactLogix systems, it extends the lifecycle of automation investments. This combination of reliability and adaptability makes it a practical choice for industrial power management.

The 1768-PB3 Allen-Bradley CompactLogix L4x DC In Power Supply may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).
Allen-Bradley 1768-PB3 CompactLogix L4x DC In Power Supply Manuals,Datasheets,Link Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
Allen-Bradley 1768-PB3 CompactLogix L4x DC In Power Supply Specs

General

  • Manufacturer Allen-Bradley
  • Model 1768-PB3
  • Condition New Original ready stock
  • Product Family 1768-PA3,1769-PA4,1769-PB2
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
  • Controller Matching: Strictly limited to CompactLogix L4x controllers; cannot be used with L1, L2, or L3 series controllers.
  • Backplane Slot Mounting: Must be installed in the dedicated power slot on the far left of the 1768 backplane.
  • Module Collaboration: Bridges and communicates with the 1769 I/O module bus via the built-in connector on the right.
  • Software Configuration Identification: The version must be accurately identified and matched in the RSLogix 5000 or Studio 5000 hardware configuration.
  • Automatic Overvoltage Cut-off: Integrated overvoltage protection circuitry prevents input voltage surges from damaging internal components.
  • Overcurrent Fuse Mechanism: Automatically limits current in the event of an output short circuit or overload, protecting expensive modules on the backplane.
  • Reverse Polarity Protection: Features DC input positive and negative reverse polarity protection to prevent equipment burnout due to incorrect field wiring.
  • Safety Isolation Barrier: High electrical isolation between input and output blocks external power grid noise from interfering with the control system.
  • Control System Power Supply: Provides a stable base DC power supply for CompactLogix L43 and L45 controller systems.
  • Extended Backplane Drive: Drives the 1768 local backplane, supporting high-performance motion control and communication modules.
  • Industrial Field Applications: Used for automation systems requiring compact control, such as assembly machinery, packaging equipment, and material handling.
  • Distributed Control Networks: Provides power support for small control cabinets acting as network nodes in complex factory environments.
Description
The Allen-Bradley 1768-PB3 serves as the primary DC input power source for CompactLogix L4x systems, operating within an input voltage range of 16.8 to 31.2V DC with a nominal 24V DC supply. With a maximum input power of 112 W and output capability ranging from 6 W to 90 W, it ensures efficient energy delivery across the control architecture. Its compact structure allows mounting on a DIN rail or panel, offering flexibility for installation in control cabinets.

Within a 1768 CompactLogix system, the Allen-Bradley 1768-PB3 distributes power through the integrated backplane, which is embedded in the controller, power supply, and I/O modules. The controller installed in slot 0 converts incoming 24V DC into regulated 5V DC and 24V DC, supplying 1769 I/O modules on the right and 1768 modules on the left. This architecture ensures organized and efficient power routing without distance limitations for 1768 modules, while maintaining defined spacing rules for 1769 modules.

The Allen-Bradley 1768-PB3 is engineered to handle demanding electrical conditions, including a maximum inrush current of 50 A and power dissipation of 22 W. It incorporates internal overcurrent protection through a non-replaceable soldered fuse and requires user-supplied external protection rated at 15 A, with recommended external protection between 8 and 12 A. The module also supports an isolation voltage of 250V, enhancing system safety and reliability.

Operational continuity is supported by ride-through and hold-up capabilities. The Allen-Bradley 1768-PB3 maintains system functionality for at least 5 ms at 90 W during power loss and provides an extended hold-up interval of 8 to 12 seconds at 1.25 W. During these periods, the output is disabled, and the PWR LED indicates status changes. This feature helps protect sensitive processes from transient power disturbances.

Designed for industrial environments, the Allen-Bradley 1768-PB3 operates within a temperature range of 0 °C to 60 °C and withstands storage conditions from -40 °C to +85 °C. It supports relative humidity from 5% to 95% noncondensing and vibration up to 5 g at 10 to 500 Hz. The unit must be installed as the leftmost module in the system, ensuring proper power distribution with a maximum backplane current of 3.5 A at 24V DC and external current of 0.25 A.
Revisions

Revision Part #

Also known as

1768-PB3 Ser A
1768-PB3/A, Series A, Rev A
Alternative Names
I768-PB3 I768PB3 1768P83 176B-PB3 1768-PA3 1769-PA2 1769-PA2K 1769-PA4
Technical notes
The 1768-PB3 is a chassis-assigned power supply delivering 24V DC input to 1768 CompactLogix systems, providing up to 3.5A at 5.2V DC and 1.5A at 24V DC backplane output current to sustain controller and expansion module operations.
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
What input voltage range supports Allen-Bradley 1768-PB3 operation?
Allen-Bradley 1768-PB3 operates within a DC input range of 16.8 to 31.2V, with a nominal rating of 24V DC for standard industrial systems.
Why Allen-Bradley 1768-PB3 requires external overcurrent protection?
Allen-Bradley 1768-PB3 includes an internal fuse that is not replaceable, so external protection rated at 15 A ensures safe operation and protects the system from electrical faults.
How Allen-Bradley 1768-PB3 distributes power inside a CompactLogix system?
Allen-Bradley 1768-PB3 supplies 24V DC through the backplane, where the controller converts it into 5V and 24V for distribution to 1769 and 1768 modules.
What mounting options are available for Allen-Bradley 1768-PB3?
Allen-Bradley 1768-PB3 supports both DIN rail and panel mounting, using M4 or #8 screws with a torque of 1.16 N·m.