APC by Schneider Electric AP4450 1U Rack Automatic Transfer Switch

Overview

The APC by Schneider Electric AP4450 is a 1U rack-mount automatic transfer switch (ATS) that provides source redundancy for 100/120V loads at up to 15A — designed for server rooms, network closets, and equipment racks where a single power feed isn't acceptable. Instead of relying on a single UPS or PDU circuit, the AP4450 accepts two independent NEMA 5-15P inputs and automatically switches to the standby source within 10ms when the primary feed fails. That transfer window is fast enough to keep most IT and security equipment running without a detectable interruption. Explore the full APC by Schneider Electric catalog to see complementary power protection products.

This unit ships as a standard 1U form factor measuring 43.7 x 431.8 x 236.2mm — a direct fit in any 19-inch rack — and weighs 4.40 kg, well within standard shelf or rail capacity. If your deployment spans a rack housing NVRs, network switches, or access control servers, the AP4450 fits cleanly into existing power planning without requiring structural changes.

Key Features

• Dual 5-15P Inputs with Automatic 10ms Transfer: Two independent NEMA 5-15P inputs connect to separate upstream sources — a UPS on one, utility on the other, for example. When the active source drops, transfer completes in 10ms maximum at high sensitivity (12ms at low sensitivity). Most connected equipment never notices a glitch; this is the central reason to install an ATS rather than a second PDU.
• Ten NEMA 5-15R Output Outlets: Ten downstream 5-15R receptacles distribute power to rack equipment. A single unit covers a fully populated 1U-to-4U equipment stack — no daisy-chaining required for typical rack densities.
• 12A Per-Outlet / 15A Input Rating (UL): Each outlet is rated at 12A under UL listing, with 15A PSE (Japan) input current. For a rack drawing 10A across all devices, this leaves meaningful headroom — you're not running at the edge of the breaker on normal loads.
• 10 kA Short Circuit Current Rating: The AP4450 is rated for 10 kA symmetrical fault current. In a building wiring environment where a fault can push thousands of amps through a circuit for milliseconds, this rating ensures the unit doesn't become the failure point during a wiring event upstream.
• Wide Input Voltage Tolerance (±10%): Accepts ±10% of nominal 100/120V, meaning the unit stays online through sags down to 90V or swells up to 132V without switching. This matters in older facilities or long cable runs where voltage regulation isn't tight.
• 50/60 Hz Dual-Frequency Input: Compatible with both 50Hz and 60Hz power grids — relevant if equipment is deployed internationally or in facilities with non-standard generation.
• Operating Altitude up to 3,000m: Rated for operation up to 3,000m elevation — covers deployments at altitude (mountain data centers, high-altitude campuses) without derating concerns.
• Operating Temperature -5°C to 45°C: Handles ambient temperatures across a wide rack environment range. At the upper end, 45°C aligns with hot-aisle conditions in high-density racks — confirm your cabinet's actual ambient before assuming safe operation at that ceiling.
• FCC Part 15 / ICES-003 / VCCI EMC Compliance: Certified for electromagnetic emissions in North American and Japanese markets — required for installation in environments with sensitive RF equipment or compliance mandates.
• cULus / PSE / UL/EN/IEC 60950-1 Safety Certifications: Safety-listed for the US, Canada, and Japan under IEC 60950-1 (information technology equipment). This is the safety baseline required for most enterprise IT and commercial security installations.

Integration and Compatibility

The AP4450 sits between two upstream power sources — typically a UPS system and a separate utility or generator feed — and presents a unified output rail to your rack equipment. It connects to any load drawing NEMA 5-15R receptacles at or below 12A per outlet. Common downstream devices in security and IT racks include NVRs, IP video servers, PoE network switches, and access control appliances.

Because the unit uses passive automatic transfer (not software-controlled switching), there is no network management interface required and no driver to install — plug-and-play redundancy with no configuration overhead. For environments requiring monitored or switched PDUs, this unit is not a replacement; it is specifically a source-redundancy device, not a remote-management PDU. If you need per-outlet switching and power monitoring alongside redundancy, evaluate higher-tier rack PDU options in the APC line.

The dual 5-15P input plugs connect directly to standard 15A circuits. Ensure your two source circuits are on separate breakers — ideally from separate panels or separate UPS units — to achieve actual redundancy. Two feeds from the same panel bus defeat the purpose if the panel itself is the failure point.

For related automatic transfer switches across different amperage and connector configurations, review the broader APC ATS family to match your specific outlet type and current requirements. See the power protection buying guide for help sizing ATS units against your rack load profiles.

Frequently Asked Questions

Q: How fast does the AP4450 switch between power sources?

A: The AP4450 transfers in 10ms maximum at high sensitivity and 12ms maximum at low sensitivity. Most rack IT and security equipment tolerates this transfer window without resetting or dropping connection.

Q: What input connectors does the AP4450 use?

A: The unit has two NEMA 5-15P input plugs, each connecting to an independent 15A circuit. Outputs are ten NEMA 5-15R receptacles.

Q: What is the maximum load the AP4450 can handle?

A: Each outlet is rated at 12A under UL listing. The input is rated at 15A (PSE). Size your total rack load to stay within the 12A per-outlet ceiling and the 15A input rating to avoid nuisance tripping.

Q: Does the AP4450 require any software or network configuration?

A: No. The AP4450 uses passive automatic transfer — it detects source failure and switches without any software, network interface, or driver. Installation is plug-in-and-done.

Q: What certifications does the AP4450 carry?

A: The AP4450 is cULus listed, PSE certified (Japan), and safety-rated to UL/EN/IEC 60950-1. EMC compliance covers FCC Part 15, ICES-003, and VCCI.

Q: Can the AP4450 be used at high altitude or in warm rack environments?

A: Yes. It is rated for operation up to 3,000m elevation and ambient temperatures from -5°C to 45°C — covering most commercial and industrial rack environments, including hot-aisle deployments.

Marty Allison

The AP4450 is the unit I recommend when a customer wants true source redundancy in a 15A rack environment without adding a managed PDU layer. The 10ms transfer time at high sensitivity is the number that matters — I've deployed these behind NVRs, access control servers, and PoE switches and never had a device restart on switchover. If you're running a security rack on a single UPS feed and calling that redundancy, the AP4450 is the missing piece.

Technical Highlights:

• 10ms Transfer (High Sensitivity): Sub-half-cycle transfer keeps connected equipment within the hold-up window of virtually all switching power supplies — no dropped NVR recordings, no access controller reboot on source failure.
• 10 kA Short Circuit Current Rating: This rating tells you the ATS won't fail catastrophically during an upstream fault event — critical in older commercial buildings where panel fault current can be high and protective coordination isn't always tight.
• ±10% Input Voltage Tolerance: Stays online from 90V to 132V, which covers the voltage sag range common in long wire runs or buildings with aging distribution infrastructure.

Deployment Considerations:

• Wire the two 5-15P inputs to genuinely separate upstream sources — separate UPS units on separate circuits from separate panels. Two feeds from the same breaker panel don't provide real redundancy if that panel's main or bus fails.
• The 12A per-outlet UL rating is the load ceiling, not the 15A input stamp. Budget your rack load against the 12A figure, not 15A, to stay within listing compliance — easy to miss when reading the headline input spec.

For a security operations rack housing an NVR, a PoE switch feeding 8–12 cameras, and an access control appliance — all on a single 15A circuit today — the AP4450 delivers dual-feed failover in 1U without a management interface to configure or maintain. It's the right fit for a mid-size commercial installation where downtime on the power side is unacceptable but a full managed ATS is budget overkill.