1771-P4S | Allen-Bradley 120VAC Power Supply Module, 5VDC/8A Output for 1771 Universal I/O Chassis
1771-P4S | Allen-Bradley 120VAC Power Supply Module, 5VDC/8A Output for 1771 Universal I/O Chassis
1771-P4S | Allen-Bradley 120VAC Power Supply Module, 5VDC/8A Output for 1771 Universal I/O Chassis
    1771-P4S | Allen-Bradley 120VAC Power Supply Module, 5VDC/8A Output for 1771 Universal I/O Chassis
1771-P4S | Allen-Bradley 120VAC Power Supply Module, 5VDC/8A Output for 1771 Universal I/O Chassis

1771-P4S | Allen-Bradley 120VAC Power Supply Module, 5VDC/8A Output for 1771 Universal I/O Chassis

Part #: 1771-P4S Manufactured by: Allen-Bradley
$522.00
$522.00
4 in Stock
Condition: New – Open box
Shipping calculated at checkout.
Product Overview
Allen Bradley PLC 5 Power Supply, 120 Volts AC Nom Input Voltage, 97-132 Volts AC Input Voltage Range, 8 Amperes (at 5 Vol...  Read more
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Product Description P/N: 1771-P4S

Description / Specifications

Description

The Allen-Bradley 1771-P4S is a single-slot AC power supply module designed for the 1771 Universal I/O platform. Supplying 5VDC at up to 8 Amps, it delivers stable backplane power for PLC-5 and 1771 I/O modules. Operating from a 97–132VAC input source, this unit is ideal for legacy systems requiring dependable power distribution. It supports parallel power supply operation for increased load capacity and system redundancy.

 

 

Technical Specifications

Condition New / Never Used Surplus
Brand Allen-Bradley
Manufacturer Rockwell Automation
Part Number 1771-P4S
Product Type PLC-5 Power Supply
Module Type AC to DC Power Supply
Module Width 1 slot
Compatible Chassis 1771-A1B, A2B, A3B, A4B
Input Voltage Range 97–132VAC
Nominal Input Voltage 120VAC
Input Frequency 47–63 Hz
Maximum Real Input Power 59 W
Maximum Apparent Input Power 89 VA
Maximum Former Load 148 VA
Output Voltage 5VDC
Backplane Output Current 8 Amps
Fuse 1.5A, 250V slow-blow
Terminal Block 5-position, P/N 941274-05
Wire Size 14 AWG max, single wire
Parallel Cabling Supports 1771-CT
Compatible Parallel Models –LSP, –LWP, –XP, –ZP, –P4S
Operating Temperature 0–60°C (32–140°F)
Storage Temperature –40–85°C (–40–185°F)
Relative Humidity 5–95% non-condensing
Isolation Voltage 2160VDC for 1 second
Power Loss Delay 13.6 ms ± 3.6 ms
Enclosure Open-style
Weight Approx. 1.85 lb (0.84 kg)

 

 

Information About 1771-P4S

The Allen-Bradley 1771-P4S is a dependable power supply designed for the PLC-5/1771 product family. Compatible with 1771-A1B, A2B, A3B, and A4B Universal I/O chassis, this module fits into a single slot and provides power to all installed I/O modules through the backplane. Its input range of 97–132VAC at 47–63 Hz makes it suitable for standard industrial AC distribution systems.

Capable of delivering a regulated 5VDC output at up to 8 Amperes, the 1771-P4S supports substantial I/O loads. Multiple power supplies can be connected in parallel using 1771-CT cabling, offering increased current capacity and improved operational reliability.

The module includes a 1.5A, 250V slow-blow fuse, which is field-replaceable for quick maintenance. It uses a 5-position terminal block (Allen-Bradley P/N 941274-05) for convenient wiring and supports 14 AWG single-wire copper conductors.

Engineered for industrial environments, the unit supports temperatures from 0 to 60°C, with storage ratings from –40 to 85°C, and a humidity tolerance of 5–95% non-condensing. Its rugged design, built-in protection, and ability to operate in parallel make the 1771-P4S a reliable component for PLC-5 legacy installations.

Key Features

  • Single-slot 120VAC power supply for 1771 chassis
  • 5VDC, up to 8A regulated backplane output
  • Parallel-ready for increased load capacity
  • Field-replaceable 1.5A slow-blow fuse
  • Supports standard 14 AWG industrial wiring
  • Compatible with all major 1771 Universal I/O chassis
  • Industrial operating range of 0–60°C
  • UL & CSA certified for global installations
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Frequently Asked Questions about 1771-P4S
Question: What is the main function of the 1771-P4S module?
Date Update:06/06/2025
Answer:

The 1771-P4S is a single-slot power supply module used to provide 5VDC power at up to 8 Amps to the backplane of an Allen-Bradley 1771 I/O chassis. It supplies power to support the operation of connected PLC-5 series modules. The module ensures reliable and regulated voltage to maintain stable system performance. It is typically installed in systems with moderate to high I/O density. The 1771-P4S also allows parallel connection to another unit to increase power capacity.

Question: Can multiple 1771-P4S modules be connected in parallel?
Date Update:06/06/2025
Answer:

Yes, the 1771-P4S supports parallel operation with compatible modules like -LSP, -LWP, -XP, -ZP, or another P4S. A 1771-CT cable is used to connect power supply modules in parallel for load sharing. This allows support for higher current requirements without splitting the system into multiple chassis. The parallel configuration improves redundancy and capacity. Installation requires synchronization and proper cabling.

Question: What is the delay time during power loss?
Date Update:06/06/2025
Answer:

The 1771-P4S features a 13.6 millisecond (+/–3.6 ms) hold-up time during power loss, which allows for brief power interruptions without immediate system shutdown. This buffering ensures minimal disturbance to the control system. It gives time for orderly shutdown or UPS transition. Short transients are handled without tripping connected modules. This feature contributes to system resilience.

Question: What are the thermal and environmental ratings of the 1771-P4S?
Date Update:06/06/2025
Answer:

It operates in 0°C to 60°C with 5–95% non-condensing humidity, and can be stored at –40°C to 85°C. Maximum heat dissipation reaches 17 Watts at 8A, and 10 Watts may affect adjacent slots, so ventilation is critical. The module is UL and CSA approved for industrial environments. Panel designers must ensure sufficient cooling and proper airflow. High temperature zones may require derating or chassis spacing adjustments.

Question: Is the 1771-P4S still being manufactured?
Date Update:06/06/2025
Answer:

The 1771-P4S is part of the legacy PLC-5 product family, which has been officially discontinued by Rockwell Automation. While no longer in production, it is still supported for existing systems through spare parts and documentation. Migration to ControlLogix or CompactLogix platforms is recommended for new projects. Lifecycle status can be confirmed through Rockwell’s product selection tool. Replacement modules or support may still be sourced via authorized distributors.

IQElectro is not an authorized distributor.
IQElectro LLC (IQElectro) is NOT an Authorized Distributor or in any way affiliated with Rockwell Automation, Siemens, or any other Manufacturers. IQElectro is NOT an Authorized Dealer of this product. The product may be of older version, date codes, or design than that available from authorized dealers. As IQElectro is not an authorized dealer of this product, the Original Manufacturer's Warranty and Support DO NOT apply. IQElectro sells SURPLUS only and DOES NOT SELL SOFTWARE or FIRMWARE licenses For more detailed information, please refer to the full version of our disclaimer policy Disclaimer Policy.
Description / Specifications

Description

The Allen-Bradley 1771-P4S is a single-slot AC power supply module designed for the 1771 Universal I/O platform. Supplying 5VDC at up to 8 Amps, it delivers stable backplane power for PLC-5 and 1771 I/O modules. Operating from a 97–132VAC input source, this unit is ideal for legacy systems requiring dependable power distribution. It supports parallel power supply operation for increased load capacity and system redundancy.

 

 

Technical Specifications

Condition New / Never Used Surplus
Brand Allen-Bradley
Manufacturer Rockwell Automation
Part Number 1771-P4S
Product Type PLC-5 Power Supply
Module Type AC to DC Power Supply
Module Width 1 slot
Compatible Chassis 1771-A1B, A2B, A3B, A4B
Input Voltage Range 97–132VAC
Nominal Input Voltage 120VAC
Input Frequency 47–63 Hz
Maximum Real Input Power 59 W
Maximum Apparent Input Power 89 VA
Maximum Former Load 148 VA
Output Voltage 5VDC
Backplane Output Current 8 Amps
Fuse 1.5A, 250V slow-blow
Terminal Block 5-position, P/N 941274-05
Wire Size 14 AWG max, single wire
Parallel Cabling Supports 1771-CT
Compatible Parallel Models –LSP, –LWP, –XP, –ZP, –P4S
Operating Temperature 0–60°C (32–140°F)
Storage Temperature –40–85°C (–40–185°F)
Relative Humidity 5–95% non-condensing
Isolation Voltage 2160VDC for 1 second
Power Loss Delay 13.6 ms ± 3.6 ms
Enclosure Open-style
Weight Approx. 1.85 lb (0.84 kg)

 

 

Information About 1771-P4S

The Allen-Bradley 1771-P4S is a dependable power supply designed for the PLC-5/1771 product family. Compatible with 1771-A1B, A2B, A3B, and A4B Universal I/O chassis, this module fits into a single slot and provides power to all installed I/O modules through the backplane. Its input range of 97–132VAC at 47–63 Hz makes it suitable for standard industrial AC distribution systems.

Capable of delivering a regulated 5VDC output at up to 8 Amperes, the 1771-P4S supports substantial I/O loads. Multiple power supplies can be connected in parallel using 1771-CT cabling, offering increased current capacity and improved operational reliability.

The module includes a 1.5A, 250V slow-blow fuse, which is field-replaceable for quick maintenance. It uses a 5-position terminal block (Allen-Bradley P/N 941274-05) for convenient wiring and supports 14 AWG single-wire copper conductors.

Engineered for industrial environments, the unit supports temperatures from 0 to 60°C, with storage ratings from –40 to 85°C, and a humidity tolerance of 5–95% non-condensing. Its rugged design, built-in protection, and ability to operate in parallel make the 1771-P4S a reliable component for PLC-5 legacy installations.

Key Features

  • Single-slot 120VAC power supply for 1771 chassis
  • 5VDC, up to 8A regulated backplane output
  • Parallel-ready for increased load capacity
  • Field-replaceable 1.5A slow-blow fuse
  • Supports standard 14 AWG industrial wiring
  • Compatible with all major 1771 Universal I/O chassis
  • Industrial operating range of 0–60°C
  • UL & CSA certified for global installations

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