APC NetShelter Rack Automatic Transfer Switch 1U 20A 120V

Overview

The APC AP4452A is an automatic transfer switch designed to provide a redundant power path for single-cord devices in a compact 1U rack-mount form factor. It monitors two independent 120 V, 20 A power sources and switches the load to the secondary input in less than 10 milliseconds if the primary source fails. This rapid transfer ensures critical equipment such as servers, switches, and storage arrays remain operational without interruption or reboot.

Equipped with ten NEMA 5-20R outlets on the rear panel, it can power multiple devices within a small rack or edge cabinet. The dual NEMA L5-20P inputs allow connection to separate branch circuits or UPS systems, supporting high-density equipment without risk of overloading.

Key features

• 1U rack-mount design that fits easily into standard server racks and edge cabinets
• Automatic transfer between two 120 V, 20 A power sources with a transfer time under 10 milliseconds to prevent downtime
• Ten NEMA 5-20R outlets provide ample power distribution for multiple devices in a single rack
• Dual NEMA L5-20P inputs enable connection to separate power feeds or UPS systems for true redundancy
• Onboard APC NMC3 network management card allows real-time load monitoring, alarm configuration, and controlled transfer via web interface, SNMP, or command-line interface
• Compatibility with EcoStruxure IT for centralized monitoring and fleet-wide management of power infrastructure
• Simple installation process with straightforward mounting and plug-in connections
• Includes a 2-year warranty with an option to extend coverage to 5 years for added peace of mind

Key specs

• Form factor: 1U rack-mount
• Input voltage: 120 V AC
• Input current rating: 20 A
• Number of outlets: 10 NEMA 5-20R
• Input connectors: Dual NEMA L5-20P
• Transfer time: less than 10 milliseconds
• Network management: APC NMC3 card with web, SNMP, and CLI support
• Warranty: 2 years standard, optional 5-year extension

Connectivity and compatibility

The AP4452A supports connection to two independent power sources, such as separate branch circuits or uninterruptible power supplies, ensuring continuous power availability. Its ten NEMA 5-20R outlets accommodate a variety of rack-mounted equipment with standard 120 V plugs. The built-in network management card integrates seamlessly with existing IT infrastructure, allowing remote monitoring and control through common protocols and interfaces.

Installation and setup

Installation is straightforward and designed for quick deployment in data centers, branch offices, or edge environments. Simply mount the unit in a standard 19-inch rack, connect the two power inputs to separate sources, and plug in your equipment. The included network management card requires minimal configuration to enable remote monitoring and control, helping you maintain uptime with minimal effort.

Ideal uses and environments

This automatic transfer switch is well suited to environments where equipment has a single power inlet but cannot afford downtime, such as branch offices, colocation cages, edge compute nodes, and labs. It supports high-density racks and is a strong choice for IT professionals who need reliable power redundancy without complex infrastructure changes. Its rapid transfer time and network management capabilities make it a practical solution for maintaining continuous operation in critical setups.