APC AR8123BLK Sliding Shelf 100lbs Capacity 45.5kg Black

APC AR8123BLK 3 Phase 30A Rackmount Automatic Transfer Switch

Overview

The APC AR8123BLK is a rack-mounted automatic transfer switch (ATS) designed for enterprise and data center applications requiring continuous 3-phase power redundancy. Electrical and facilities engineers deploy this switch to ensure critical IT infrastructure, including servers, storage arrays, and networking equipment, maintains uninterrupted operation during utility interruptions or maintenance events. The AR8123BLK automatically transfers connected loads between two power sources, mitigating downtime and preserving operational continuity.

Rated for 30A per phase, the ATS provides rapid switching between dual utility or generator feeds. Typical switchover occurs in under 8 milliseconds, reducing exposure to voltage interruption and minimizing risk to sensitive electronic equipment. Input and output connections utilize standard hardwired terminal blocks, allowing seamless integration with rack-mounted PDUs or facility distribution panels. The front panel includes LED indicators for operational status and dry contacts for remote monitoring or centralized management system integration.

The unit is designed for installation in standard 19-inch racks, consuming 3U of rack space. It supports dual-feed redundancy for rack-mounted servers, storage, and networking devices in IDF closets, edge computing racks, and small to medium data center cabinets. Its compact footprint enables installation alongside UPS systems and PDUs, providing coordinated protection without occupying excessive cabinet space.

Integration capabilities include dry contact signaling to building management and IT monitoring systems. The AR8123BLK is compatible with APC and third-party PDUs, supporting coordinated source switching in environments with 208V, 220V, or 240V three-phase feeds. This allows IT teams to maintain high availability without manual intervention.

A typical deployment scenario includes a remote office or branch data rack with dual utility feeds or a combination of utility and generator input. The switch automatically transfers power to the secondary source during primary feed failures, enabling continuous operation of connected IT systems.

This ATS is not suitable for single-phase-only deployments or applications exceeding 30A per phase. Larger data center facilities requiring modular expansion, higher amperage, or full building-level ATS integration should select enterprise-class ATS systems instead.

Key Features

• 3-phase 30A rack-mounted automatic transfer switch
• Sub-8 ms switchover for sensitive IT loads
• LED indicators and dry contacts for monitoring
• Compatible with dual-feed UPS and PDU systems
• Standard 19-inch 3U rackmount form factor

Technical Specifications