1756-PB72 | Allen-Bradley ControlLogix Standard Power Supply Module

Product Overview

The 1756-PB72 is a standard power supply module from Allen-Bradley designed for ControlLogix systems. It delivers reliable DC power to the chassis, supporting multiple voltage rails and offering protection against overcurrent conditions. Engineered for high-performance industrial environments, this module ensures stable operation across a wide temperature range and meets reinforced insulation standards for safe operation. Its compact design allows installation on the left side of compatible ControlLogix chassis.

Key Features

• Brand: Allen-Bradley

• Model: 1756-PB72

• Product Type: Standard Power Supply Module

• Input Voltage Range: 18–32 V DC

• Nominal Input Voltage: 24 V DC

• Maximum Input Power: 95 W

• Maximum Output Power: 75 W @ 0–60°C (32–140°F)

• Power Consumption: 20 W @ 0–60°C (32–140°F)

• Power Dissipation: 68.2 BTU/hr

• Hold-up Time: 35 ms @ 18 V DC, 40 ms @ 24–32 V DC

• Maximum Inrush Current: 30 A

• Current Capacities: 1.5 A @ 1.2 V DC, 4 A @ 3.3 V DC, 10 A @ 5.1 V DC, 2.8 A @ 24 V DC

• Overcurrent Protection: User-supplied 15 A

• Fusing: Non-replaceable internal fuse

• Isolation Voltage: 250 V continuous, reinforced insulation; tested at 3500 V DC for 60 s

• Weight: 0.95 kg (2.10 lb)

• Dimensions: 14.0 × 11.2 × 14.5 cm (5.51 × 4.41 × 5.71 in)

• Module Location: Left side of 1756 chassis

• Chassis Compatibility: Series A and Series B

• Wire Size: 2.5 mm² (14 AWG) solid or stranded copper, rated ≥90°C (194°F), insulation ≤1.2 mm

• Wire Category: Single conductor per power port

• Conductor Screw Torque: 0.8 N·m (7 lb·in)

• Temperature Code: T4 (North American and IEC)

• Enclosure Rating: Open-style, no enclosure

Application Scenarios

The 1756-PB72 is ideal for:

• Providing stable power to ControlLogix chassis in industrial automation systems

• Supporting multiple I/O modules and communication devices simultaneously

• Maintaining reliable operation in environments with fluctuating input voltages

• Enabling safe integration with user-supplied overcurrent protection

Performance and Design

• Multi-Voltage Support: Provides power for both low-voltage logic circuits and 24 V DC rails

• Enhanced Safety: Reinforced insulation and tested isolation ensure operator and system protection

• Compact and Accessible: Designed for left-side installation, simplifying chassis wiring and maintenance

• Efficient Power Delivery: Minimizes heat generation while delivering maximum output power

FAQs

Q: What is the nominal input voltage for the 1756-PB72?
A: The nominal input voltage is 24 V DC, with a range of 18–32 V DC.

Q: Where is this module installed in the ControlLogix chassis?
A: The 1756-PB72 installs on the left side of Series A and Series B chassis.

Q: Does it have overcurrent protection?
A: Yes, it supports user-supplied overcurrent protection up to 15 A.

Q: What is the hold-up time at 24 V DC input?
A: The hold-up time is 40 milliseconds at 24 V DC.

Q: Can it operate in high-temperature environments?
A: Yes, it operates safely from 0°C to 60°C (32–140°F).