The IBM 45D9861 575W AC High Efficiency Power Supply (Model DCA-T19) is an enterprise-grade PSU designed for IBM 5802 and 5877 I/O expansion units. It provides stable and efficient power delivery to support high-performance I/O drawer environments used in IBM Power Systems infrastructure.

This power supply is an essential component of the expansion unit’s redundant power system, helping ensure continuous operation of connected PCIe I/O modules and maintaining system reliability in data center environments. It is designed for hot-swap operation, allowing replacement without major system downtime (depending on system state and configuration).

The unit is commonly used in IBM POWER-based server ecosystems where expansion drawers provide additional PCIe connectivity for networking, storage, and specialized adapter cards.

Specifications:

• Brand: IBM
• Part Number: 45D9861
• Model: DCA-T19
• Power Output: 575W
• Type: AC High Efficiency Server Power Supply
• Compatibility: IBM 5802 / 5877 I/O Expansion Units
• Function: Power delivery for I/O drawer systems
• Design: Redundant hot-swap PSU module
• Application: Enterprise server I/O expansion environments
• Condition: Used (pulled from working systems unless otherwise stated)

Features:

• Genuine IBM power supply for I/O expansion systems
• Provides reliable 575W output for stable operation
• Designed for 5802 and 5877 expansion unit environments
• Supports redundant power configurations
• Helps maintain uptime in enterprise data center systems
• Built for continuous 24/7 operation
• Ideal replacement for failed or aging PSU modules
• Ensures stable power delivery to PCIe I/O infrastructure
• Durable enterprise-grade construction for long-term reliability
• Essential component for IBM Power Systems expansion architecture