- APC NetShelter Rack Automatic Transfer Switch — provides redundant A+B power to single-corded equipment
- 10A / 230V / 1U rackmount — automatic transfer between two upstream power sources in under 10 milliseconds
- NMC3 with web, SNMP, CLI management; environmental monitoring port for temperature/humidity sensors
- Field-replaceable NMC — upgrade firmware or replace the network card without taking the ATS offline
- Daisy-chain up to 32 Rack ATSs on a single IP address for consolidated management
- 2-year standard warranty (5-year extended available)
Product Highlights
Documents
Description
APC NetShelter Rack ATS AP4421A — 10A / 230V Automatic Transfer Switch
The AP4421A is an APC NetShelter Rack Automatic Transfer Switch (ATS) — a key component in fault-tolerant power architectures. It accepts two independent power inputs (A and B feeds) and automatically transfers to the secondary input if the primary fails. Transfer time is under 10 milliseconds — fast enough to be invisible to virtually all connected equipment.
Why a Rack ATS
Most servers, switches, and other rack equipment have a single power supply (single-corded loads). In a redundant power architecture with two UPS feeds (A+B), single-corded equipment can only connect to one feed — defeating the redundancy. A Rack ATS solves this: two upstream feeds in, one downstream feed to single-corded equipment, automatic transfer to whichever input is healthy.
Key Features
- 10ms Transfer Time: Fast enough to be transparent to connected equipment; well under the typical hold-up time of server power supplies.
- Field-Replaceable NMC3: Upgrade firmware or replace the network management card without taking the ATS offline.
- Environmental Monitoring Port: Add APC temperature/humidity sensors directly to the ATS for combined power and environmental monitoring.
- Daisy-Chain Management: Up to 32 Rack ATSs on a single IP address — consolidated network management and reduced switch port consumption.
- Secure NMC3 Management: SNMP v3, web/CLI, EcoStruxure IT — same management interface as APC PDUs and UPS units for unified operations.
- 5th-Generation Reliability: Mature platform with industry-leading reliability metrics for rack-level redundancy.
Technical Specifications
| Specification | Value |
|---|---|
| Current Rating | 10A |
| Voltage | 230V |
| Form Factor | 1U Rackmount |
| Output Outlets | 12 C13 |
| Transfer Time | < 10ms |
| Network | NMC3 (field-replaceable) |
| Management | SNMP v3, Web/CLI, EcoStruxure IT |
| Daisy-Chain | Up to 32 ATSs per IP |
| Warranty | 2-year standard (5-year extended available) |
Ideal Applications
- Data Centers with Dual Power Feeds: Provide redundancy to single-corded servers in A+B power architectures.
- Healthcare Critical Systems: Redundant power for patient monitoring, EMR systems, and imaging control — critical loads where A+B redundancy is required for compliance.
- Financial Services Infrastructure: Trading systems, transaction processing, and banking transaction infrastructure where every transfer event must be transparent.
- Government Mission Systems: Federal IT environments specifying N+1 power architectures.
- Telecom and Carrier Facilities: Dual-feed redundancy for single-corded edge equipment.
Designing a Redundant Power Architecture — Questyme Can Help
A+B power architecture involves more than the ATS itself: upstream UPS sizing, PDU configuration, breaker coordination, and integration with existing power monitoring. Questyme has scoped redundant power deployments for data centers, healthcare facilities, and government IT environments. Contact a Questyme power expert to design your redundant power architecture.
Specifications
Overview
Model
Rack ATS, 230V, 10A, C14 in, (12) C13 out
Main
Input Voltage
230 AC 1 PH
Output Voltage
230 AC 1 PH
Input Connection Type
IEC 60320 C14 10 A 2P+E
Removable Battery
Yes
Physical
Color
Black
Mounting Mode
Rack-mounted
Mounting Preference
No preference
Product Line
OPTIMUM RACK PDU
Shipping Dimensions
Height: 4.33Width: 13.78Length: 23.62
Shipping Weight
11.949 lb
UPC Code
731304432425
Lead time
Usually in Stock
Provided Equipment
Mounting Hardware
Rack Mounting brackets
Rack Mounting brackets
Standards
EN 55022 Class A
FCC Part 15 class A
FCC Part 15 class A
Product Certifications
EN 55022 class A
FCC part 15 class A
FCC part 15 class A
Environmental
Carbon Footprint (kg CO₂ eq, Total Life Cycle)
451
Packaging Made with Recycled Cardboard
Yes
Packaging without Single Use Plastics
No
Ambient Air Temperature for Operation
23-113 ?F
Ambient Air Temperature for Storage
'-13-149 ?F
Relative Humidity
5-95 %
Storage Relative Humidity
5-95 %
Operating Altitude
0-10000 ft
Storage Altitude
0.0000000000-50000.0000000000 ft
Packaging / Certifications
Unit Type of Package 1
PCE
Packaging Made with Recycled Cardboard
Yes
Packaging without Single Use Plastics
No
WEEE
The product must be disposed on European Union markets following specific waste collection and never end up in rubbish bins.
Take-back
Yes
EU RoHS Directive
Compliant