Redundant Power Chassis Adapter | 1756-PSCA2 | Allen Bradley

Allen Bradley 1756-PSCA2 ControlLogix Redundant Power Supply Chassis Adapter

Product Description

The 1756-PSCA2 (1756-PSCA2) is a specialized chassis adapter designed for high-availability Allen-Bradley ControlLogix systems. It serves as the physical and electrical interface required to implement a redundant power architecture. This module occupies the standard power supply slot on the far-left side of a ControlLogix chassis and provides two connection ports for redundant power cables.

Unlike standard power supplies that convert AC/DC power internally, the 1756-PSCA2 (1756-PSCA2) acts as a passive bridge. It aggregates power from two external redundant supplies (such as the 1756-PA75R or 1756-PB75R) and distributes it to the chassis backplane. This configuration ensures that if one power source or cable fails, the system continues to operate without interruption, making it a critical component for zero-downtime manufacturing and process control applications.

Detailed Technical Specifications

The 1756-PSCA2 adapter facilitates power redundancy with the following industrial parameters:

• Manufacturer: Allen-Bradley (Rockwell Automation)

• Model/Part Number: 1756-PSCA2

• Module Type: Redundant Power Supply Chassis Adapter

• Chassis Location: Left-side power supply slot (any 1756 chassis)

• Compatibility: 1756-PA75R (AC), 1756-PB75R (DC), 1756-PAR2, 1756-PBR2

• Backplane Current (24V DC): 125 mA

• Power Dissipation (Max): 25.7 Watts @ 30 °C; 21.3 Watts @ 60 °C

• Operating Temperature: 0 °C to +60 °C (32 °F to 140 °F)

• Storage Temperature: -40 °C to +85 °C (-40 °F to 185 °F)

• Relative Humidity: 5% to 95% non-condensing

• Dimensions: Standard ControlLogix Power Supply width

• Weight: 0.26 kg (0.56 lbs)

• Enclosure Type: None (Open-style)