Allen Bradley 1769-PA4 Expansion Power Supply

The AB 1769-PA4 is a Compact I/O expansion power supply module designed to deliver backplane power to I/O and specialty modules within CompactLogix and MicroLogix 1500 systems. Operating from a wide-range 85–264V AC input, it provides regulated 5V and 24V DC outputs at 4A and 2A respectively—supporting up to eight modules per bank without derating.

Compact and DIN rail mountable, the 1769-PA4 power supply is ideal for distributed automation architectures requiring reliable power in small-to-medium-sized control cabinets. It features automatic input voltage sensing and is suitable for global deployment without manual voltage selection.

Technical Specifications

Model: 1769PA4
Series: Compact I/O
Type: Expansion Power Supply
Input Voltage Range: 85–264 V AC
Output Voltages: 5V DC @ 4 A, 24V DC @ 2 A
Power Output: 240 W
Application: Powering Compact I/O modules in distributed control systems

Electrical Specifications

Input Voltage (AC 50/60 Hz): 110–230 V AC (auto-selecting)
Input Frequency: 47–63 Hz
Output Power: 240 W total
Output Current:
• 4 A at 5V DC
• 2 A at 24V DC

Overload Protection: Electronic current limiting
Inrush Current: 30 A max
Short Circuit Protection: Yes
Power Supply Distance Rating: 8 modules (with expansion cable)
Redundancy: Not supported
Internal Fuse: Non-replaceable (protective circuit)

Mechanical Specifications

Width: 70 mm
Height: 118 mm
Depth: 87 mm
Mounting Type: DIN rail or panel mount
Cooling Method: Natural convection (fanless)
Connection Type: Screw terminal for AC input
Weight: Approx. 0.6 kg
Installation Orientation: Vertical recommended

Environmental Specifications

Operating Temperature: 0…60 °C
Storage Temperature: –40…85 °C
Relative Humidity: 5% to 95% non-condensing
Shock Resistance: 30 g, 11 ms (IEC 60068-2-27)
Vibration Resistance: 2 g, 10–500 Hz (IEC 60068-2-6)
Altitude Rating: Up to 2000 m
Pollution Degree: 2
Ingress Protection: IP20
Certifications: CE, UL, cULus, RCM, RoHS

Compliance & Communication

System Compatibility: CompactLogix, MicroLogix 1500
Communication Ports: None (power module only)
Configuration Required: None – plug and play with I/O bank
Expansion Support: Supplies power to up to 8 I/O modules
Fieldbus Integration: N/A – power only
EMC & Safety Compliance: EN 61131-2, UL 508, CSA 22.2

Key Features & Benefits

✅ Dual Output Power (5V/24V) – Supports a variety of I/O and specialty modules within Compact I/O systems

✅ Wide Input Range (85–264V AC) – Auto-detects voltage for global installation without selection switches

✅ DIN Rail Mountable – Space-saving and ideal for distributed installations

✅ Reliable Overload Protection – Built-in safeguards against short circuit and overcurrent events

✅ Compatible with Expansion Banks – Supplies backplane power for up to 8 modules per segment

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