APC AR8105BLK 2U Rack Shelf, 50lbs Capacity

APC AR8105BLK 3 Phase 50A Rackmount Automatic Transfer Switch

Overview

The APC AR8105BLK is a 3-phase, 50A rack-mounted automatic transfer switch (ATS) engineered for enterprise and data center environments requiring uninterrupted power for critical IT infrastructure. Facilities and IT teams deploy this ATS to maintain continuous operation of servers, storage systems, and network equipment during utility interruptions or maintenance events. The device automatically transfers loads between dual power sources, reducing downtime risk for sensitive electronics.

Rated for 50A per phase, the AR8105BLK provides rapid switchover between utility or generator feeds, typically in less than 8 milliseconds, minimizing disruption to connected devices. Input and output connections use standard hardwired terminal blocks, while dry contact outputs allow integration with remote monitoring and management systems. Front-panel LED indicators provide status on input sources, load, and fault conditions to support operational monitoring.

The unit installs in standard 19-inch racks and occupies 3U of rack space, making it suitable for IDF racks, edge computing cabinets, and small-to-medium data center enclosures requiring dual-feed power redundancy. Its compact rackmount design allows installation alongside UPS systems and PDUs without consuming excessive cabinet space.

Integration capabilities include dry contact signaling for building management systems and IT monitoring platforms, enabling alerting and coordinated source switching. The AR8105BLK is compatible with APC and third-party PDUs, supporting both utility-to-utility and utility-to-generator power redundancy configurations for North American and international three-phase systems.

A typical deployment scenario includes a remote or branch office rack with dual incoming feeds, ensuring that servers, network switches, and storage remain operational during primary utility interruptions. The switch automatically transfers loads to the secondary source, maintaining continuous power to critical infrastructure.

This ATS is not designed for single-phase applications or installations exceeding 50A per phase. Larger facilities requiring higher amperage, modular ATS expansion, or full building-level integration should select enterprise-class ATS solutions.

Key Features

• 3-phase 50A rack-mounted automatic transfer switch
• Sub-8 ms rapid source switching for critical loads
• LED indicators and dry contacts for monitoring
• Compatible with dual-feed UPS and PDU installations
• Standard 19-inch 3U rackmount form factor

Technical Specifications