Allen-Bradley 1771-P4R redundant power supply module

l The Allen-Bradley 1771-P4R is a redundant power supply module designed for the Allen-Bradley 1771 PLC-5 control system. It is installed in a 1771 chassis to improve system reliability, minimize unexpected shutdowns, and maintain continuous industrial operations during power supply failures. By supporting redundant power configurations, the module helps prevent costly downtime in critical automation applications.

l The 1771-P4R operates with an input voltage range of 97–132V AC at 47–73 Hz and delivers a regulated 5V DC output with up to 8A output current per module. Using an N+1 redundancy configuration, multiple modules can work together to provide higher system current capacity and backup protection. In the event that the primary power supply fails, the secondary module automatically takes over without interrupting controller operation.

l This module occupies a single slot within the 1771 chassis and includes built-in protection features such as fuse protection, branch circuit protection, and alarm outputs for monitoring power supply conditions. The unit is engineered for industrial environments with an operating temperature range of 0 to 60°C and humidity tolerance of 5–95% non-condensing. It is certified to CSA, NEMA, and UL standards for dependable industrial use.

Manufacturer

Allen Bradley

Category

PLCs

Product Line

PLC 5

Input voltage frequency

47-63 Hz

Output voltage

5 VDC

Output current

8:00 AM

Maximum output current at 60o C using N+1 Redundancy

8A (2 unit system); 14A (3 unit system); 20A (4 unit system)

Alarm Relay Rating

250 VAC

Wiring Block, AC power

A-B part number 941274-05 (Wago PN 231-205/000-008)

Wiring Block, Relay

A-B part number 941274-03 (Wago PN 231-203/000-008)

Operating temperature

32 to 131oF

Storage Temperature

-40 to 185oF

Relative Humidity

5-95 %

Nom Input Voltage

120 Volts AC

Max Real Input Power

59 Watts

Max Apparent Input Power

92 VA

Max Xformer Load

148 VA

User Output Current

N/A

Backplane Output Current

8 Amperes (at 5 Volts DC)

Frequency

47-63 Hertz

Fuse

1.5 Amperes, 250 Volts, slow-blow

Cabling

Redundancy Cable for P4R (Included)

Paralleled

N/A

Location

1771 Chassis, 1 Slot

Redundant Power Design

Supports N+1 redundancy for improved PLC system availability

Stable Output

Provides regulated 5V DC output at 8A

Automatic Backup Switching

Secondary power supply automatically takes over during failure

Wide Input Voltage Range

Operates on 97–132V AC input power

High System Capacity

Supports up to 20A output in a 4-unit redundant system

Compact Installation

Occupies only one slot in the 1771 chassis

Built-in Protection

Includes fuse protection and branch circuit protection

Alarm Monitoring

Equipped with alarm output for power fault indication

Industrial Reliability

Designed for harsh industrial environments

Certified Safety Standards

CSA, NEMA, and UL certified

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