1771-P4S | Allen-Bradley PLC-5 Power Supply, 1-Slot, 8A, 120V AC
1771-P4S | Allen-Bradley PLC-5 Power Supply, 1-Slot, 8A, 120V AC
1771-P4S | Allen-Bradley PLC-5 Power Supply, 1-Slot, 8A, 120V AC
    1771-P4S | Allen-Bradley PLC-5 Power Supply, 1-Slot, 8A, 120V AC
1771-P4S | Allen-Bradley PLC-5 Power Supply, 1-Slot, 8A, 120V AC

1771-P4S | Allen-Bradley PLC-5 Power Supply, 1-Slot, 8A, 120V AC

Part #: 1771-P4S Manufactured by: Allen-Bradley
Regular price
$665.00
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$665.00
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Condition: New-Surplus Original Box
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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 Power supply module from the 1771 product family. This module is compatible for use with the 1771-A1B, -A2B, -A3B, and -A4B Universal I/O Chassis. It has a power supply voltage requirement of 97-132VAC, 47-63 Hz and delivers a maximum output current of 8 Amperes. This power supply module supports parallel cabling and pairing to another power supply unit for increased output.

 

Technical Specifications 

Brand Allen-Bradley
Manufacturer Rockwell Automation
Part Number 1771-P4S
Built-in fuse 1.5A 250V Slow-blow
Nominal input voltage 120V AC
Input Frequency range 47-63 Hz
Product Description Power Supply module
Maximum output current 8 A
Output voltage 5VDC
Module width 1-slot
Wire size 14 AWG max (single wire only)
Input Voltage Range 97-132VAC
5-position Terminal Block A/B P/N 941274-05; Wago 1 P/N 231-205/000-008 (1 included with each power supply)
Module Type Power Supply
Nom Input Voltage 120 Volts AC
Max Real Input Power 59 Watts
Maximum Apparent Input Power 89 VA
Maximum Former Load 148 VA
Backplane Output Current 8 Amps (at 5 Volts DC)
Frequency 47 to 63 Hertz
Fuse 1.5 Amps, 250 Volts, slow-blow
Cabling 1771-CT
Paralleled -LSP, -LWP, -XP, -ZP, -P4S
Location 1771 Chassis, 1 Slot

  

 

Information About 1771-P4S

The Allen-Bradley 1771-P4S is a PLC 5 automation platform power supply. This module is a single-slot module that is used to deliver power to the backplane which is used by any Allen-Bradley 1771 modules to operate their individual circuitries.

The 1771-P4S is compatible for use with 1771-A1B, 1771-A2B, 1771-A3B, and 1771-A4B Universal I/O Chassis. It operates when provided with an input supply range of 92-132VAC along an input frequency range of 47-63 Hz while the module’s nominal input supply voltage is 120VAC. This power supply module is capable of providing an output voltage of 5VDC and output current of 8 Amperes. This module supports operation along another Power supply connected in parallel using the Parallel cable connector. This connection increases the power being delivered to the backplane, enabling more modules to be operated without the need of partitioning to another rack.

The 1771-P4S comes with a replaceable fuse. The built-in fuse is a 1.5A, 250V Slow-blow which can be replaced by an approved equivalent. This module weighs 1.85 lbs (0.84 kg) and uses the 5-position terminal block with catalog number Allen-Bradley P/N 941274-05, Wago 1 P/N 231-205/000-008. The terminal block is provided with each power supply module.

When terminating signal wires to the power supply, Allen-Bradley recommends use of a 14 American Wire Gauge (AWG) single or solid wire only.

The 1771-P4S power supply module’s operating temperature is 0 to 60°C (32 to 140 °F), storage temperature of -40 to 85° C (-40 to 185 °F) and relative humidity of 5-95%, non-condensing.

The module has a voltage range of 97 to 132 Volts AC with a real input power rating of 59 W and apparent power of 89 VA at a 50 to 60 Hertz line frequency. It offers an output voltage of 5.06 Volts DC and it supplies 8 Amps of maximum current at 5 Volts DC and it may be used with an optional 150 Amps recommended transformer. The 1771-P4S has circuit voltage isolation tested for 1 second at 2160 Volts DC and it offers 15 Amps of branch circuit protection and the module is fused with a 125 Volts, 5 Amps slow-blow fuse, a Bussman MDX 1. 5 fuse, or a Littel 313001. 5 fuse. The 1771-P4S dissipates 4 Watts maximum heat at 2 Amps, 17 Watts maximum heat at 8 Amps when operational, and 10 Watts maximum heat from an adjacent slot. The module has a power loss delay period of 13. 6 milliseconds (+/-3. 6 milliseconds) and the module's circuitry is adapted to a 14 AWG copper wire size with 3/64-inch maximum insulation. It can be keyed properly on the chassis by connecting the connection bands between pins 12 and 14, and pins 20 and 22 of the backplane top connector. The 1771-P4S has an operational temperature range between 0 and 60 degrees Celsius at a 5 to 95% non-condensing humidity rating and it is UL and CSA-certified. The module weighs about 1.04 kilograms (2. 3 pounds) and is built in an open enclosure.



Manufacturer information

Allen-Bradley, a brand of Rockwell Automation, specializes in manufacturing industrial automation equipment. The product range includes programmable logic controllers (PLCs), motion control systems, safety devices, motor control equipment, automation software, and HMI panels. Allen-Bradley products are known for their reliability and integration with other systems.

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.
QElectro 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 Power supply module from the 1771 product family. This module is compatible for use with the 1771-A1B, -A2B, -A3B, and -A4B Universal I/O Chassis. It has a power supply voltage requirement of 97-132VAC, 47-63 Hz and delivers a maximum output current of 8 Amperes. This power supply module supports parallel cabling and pairing to another power supply unit for increased output.

 

Technical Specifications 

Brand Allen-Bradley
Manufacturer Rockwell Automation
Part Number 1771-P4S
Built-in fuse 1.5A 250V Slow-blow
Nominal input voltage 120V AC
Input Frequency range 47-63 Hz
Product Description Power Supply module
Maximum output current 8 A
Output voltage 5VDC
Module width 1-slot
Wire size 14 AWG max (single wire only)
Input Voltage Range 97-132VAC
5-position Terminal Block A/B P/N 941274-05; Wago 1 P/N 231-205/000-008 (1 included with each power supply)
Module Type Power Supply
Nom Input Voltage 120 Volts AC
Max Real Input Power 59 Watts
Maximum Apparent Input Power 89 VA
Maximum Former Load 148 VA
Backplane Output Current 8 Amps (at 5 Volts DC)
Frequency 47 to 63 Hertz
Fuse 1.5 Amps, 250 Volts, slow-blow
Cabling 1771-CT
Paralleled -LSP, -LWP, -XP, -ZP, -P4S
Location 1771 Chassis, 1 Slot

  

 

Information About 1771-P4S

The Allen-Bradley 1771-P4S is a PLC 5 automation platform power supply. This module is a single-slot module that is used to deliver power to the backplane which is used by any Allen-Bradley 1771 modules to operate their individual circuitries.

The 1771-P4S is compatible for use with 1771-A1B, 1771-A2B, 1771-A3B, and 1771-A4B Universal I/O Chassis. It operates when provided with an input supply range of 92-132VAC along an input frequency range of 47-63 Hz while the module’s nominal input supply voltage is 120VAC. This power supply module is capable of providing an output voltage of 5VDC and output current of 8 Amperes. This module supports operation along another Power supply connected in parallel using the Parallel cable connector. This connection increases the power being delivered to the backplane, enabling more modules to be operated without the need of partitioning to another rack.

The 1771-P4S comes with a replaceable fuse. The built-in fuse is a 1.5A, 250V Slow-blow which can be replaced by an approved equivalent. This module weighs 1.85 lbs (0.84 kg) and uses the 5-position terminal block with catalog number Allen-Bradley P/N 941274-05, Wago 1 P/N 231-205/000-008. The terminal block is provided with each power supply module.

When terminating signal wires to the power supply, Allen-Bradley recommends use of a 14 American Wire Gauge (AWG) single or solid wire only.

The 1771-P4S power supply module’s operating temperature is 0 to 60°C (32 to 140 °F), storage temperature of -40 to 85° C (-40 to 185 °F) and relative humidity of 5-95%, non-condensing.

The module has a voltage range of 97 to 132 Volts AC with a real input power rating of 59 W and apparent power of 89 VA at a 50 to 60 Hertz line frequency. It offers an output voltage of 5.06 Volts DC and it supplies 8 Amps of maximum current at 5 Volts DC and it may be used with an optional 150 Amps recommended transformer. The 1771-P4S has circuit voltage isolation tested for 1 second at 2160 Volts DC and it offers 15 Amps of branch circuit protection and the module is fused with a 125 Volts, 5 Amps slow-blow fuse, a Bussman MDX 1. 5 fuse, or a Littel 313001. 5 fuse. The 1771-P4S dissipates 4 Watts maximum heat at 2 Amps, 17 Watts maximum heat at 8 Amps when operational, and 10 Watts maximum heat from an adjacent slot. The module has a power loss delay period of 13. 6 milliseconds (+/-3. 6 milliseconds) and the module's circuitry is adapted to a 14 AWG copper wire size with 3/64-inch maximum insulation. It can be keyed properly on the chassis by connecting the connection bands between pins 12 and 14, and pins 20 and 22 of the backplane top connector. The 1771-P4S has an operational temperature range between 0 and 60 degrees Celsius at a 5 to 95% non-condensing humidity rating and it is UL and CSA-certified. The module weighs about 1.04 kilograms (2. 3 pounds) and is built in an open enclosure.



Manufacturer information

Allen-Bradley, a brand of Rockwell Automation, specializes in manufacturing industrial automation equipment. The product range includes programmable logic controllers (PLCs), motion control systems, safety devices, motor control equipment, automation software, and HMI panels. Allen-Bradley products are known for their reliability and integration with other systems.

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