APC AP4453A – 2U Rack Automatic Transfer Switch 30 A 120 V

Overview

The APC AP4453A is a rack‑mounted automatic transfer switch (ATS) designed to maintain AC power continuity for single‑powered IT loads by automatically transferring the load between two redundant 120 V AC sources without manual intervention. This device is deployed by data center engineers and facilities teams in server, networking, and telecom cabinets where uninterrupted supply from dual sources such as separate UPS or utility feeds is mandated.

It supports dual AC inputs via two NEMA L5‑30P inlet connectors, accepting up to 30 A continuous current at 120 V AC. The internal transfer mechanism monitors both sources and transitions the load when one source fails or becomes unacceptable, enabling higher rack availability in critical power architectures.

Configured as a 2U rack mount unit, the AP4453A exposes sixteen NEMA 5‑20R switched outlets on its rear panel, providing centralized distribution for up to sixteen single‑corded devices. The form factor and outlet count make it suitable for dense rack environments where multiple devices must share redundant feeds.

An integrated management module (field‑replaceable Network Management Card 3) allows remote monitoring, configuration, and event logging via Web UI, SNMP, and CLI, enabling consolidated control alongside other infrastructure devices. Seamless source switching with transfer times typically under 10 ms helps reduce disruption to connected electronics.

This unit does not generate power on its own; it simply switches the load between available AC sources. It must be paired with two independent live sources — such as utility mains and UPS feeds — to ensure continuous service when one source fails.

Key Features

• Dual input automatic transfer switch for redundant 120 V AC feeds
• 30 A continuous current support with robust switching relay
• 16 NEMA 5‑20R switched outlets for rack load distribution
• Field‑replaceable NMC3 network management with Web/SNMP/CLI access
• Rack‑mount 2U form factor with seamless source transfer < 10 ms