APC Rack Automatic Transfer Switch AP4421

The APC AP4421 Rack Automatic Transfer Switch delivers enterprise-grade power source redundancy for mission-critical rack-mounted equipment, providing automatic seamless failover between two independent power sources to ensure continuous operation and maximum uptime in data centers, server rooms, and critical infrastructure environments.

This intelligent 1U rackmount ATS represents APC by Schneider Electric’s commitment to power reliability, offering the essential redundancy layer that prevents single points of failure in critical power distribution systems.

Key Features

• 1U rackmount form factor
• Dual 230V AC inputs (redundant feeds)
• 16A / 3.6kW output capacity
• 8 x IEC C13 output outlets
• Automatic failover <10ms
• Manual override capability
• Network management compatible
• LED status indicators
• Audible alarms
• Hot-swappable design

Automatic Transfer Switch Operation

Intelligent Redundancy:

• Monitors both power sources continuously
• Automatic detection of primary source failure
• Seamless transfer to secondary source
• Sub-10ms transfer time (sub-cycle)
• No interruption to connected equipment
• Automatic return to primary when restored
• Prevents single point of failure

Transfer Logic:

• Primary source preference
• Configurable transfer thresholds
• Voltage monitoring
• Frequency monitoring
• Intelligent source selection
• Prevents oscillation between sources

Dual Input Configuration

Redundant Power Sources:

• Input 1: Primary power source
• Input 2: Secondary/backup power source
• Independent AC inputs
• 230V operation
• 16A per input capacity
• Different circuit compatibility

Input Source Examples:

• Primary: Utility grid
• Secondary: Generator
• Dual UPS systems
• Separate electrical panels
• Different PDUs
• Redundant power infrastructure

16A / 3.6kW Capacity

Power Delivery:

• 16 Amps maximum output
• 3.6kW at 230V (3680W)
• Supports multiple devices
• Server and networking equipment
• Adequate for full rack loads
• Commercial-grade capacity

Load Examples:

• Multiple 1U/2U servers
• Network switches and routers
• Storage arrays
• Telecommunications equipment
• Security appliances
• Monitoring systems

Eight IEC C13 Outlets

Output Configuration:

• 8 x IEC C13 outlets
• Standard server/networking outlets
• All outlets on single circuit
• Simultaneous device connection
• IEC C14 compatible equipment
• Universal rack compatibility

Connected Equipment:

• Rack servers
• Network switches
• Routers and firewalls
• Storage devices
• Telecom equipment
• KVM switches
• Console servers

Sub-10ms Transfer Time

Seamless Failover:

• Transfer time <10 milliseconds
• Sub-cycle switching
• No interruption to equipment
• Maintains server uptime
• Network connectivity preserved
• Zero downtime switching
• IT-grade performance

Why Speed Matters:

• Servers continue operating
• Network stays online
• No packet loss
• No connection drops
• Applications unaffected
• Business continuity maintained

Network Management

Remote Monitoring:

• Network management card compatible
• Web interface access
• SNMP monitoring
• Email/SMS notifications
• Event logging
• Status reporting
• Remote control capability

Management Features:

• Real-time status monitoring
• Historical data logging
• Alarm notifications
• Source quality monitoring
• Transfer event tracking
• Configuration management

Manual Override

Control Options:

• Automatic mode (default)
• Manual source selection
• Override capability
• Testing functionality
• Maintenance mode
• User-controlled switching

Use Cases:

• Planned maintenance
• Source testing
• Troubleshooting
• Load balancing
• Commissioning
• Manual failover testing

LED Status Indicators

Front Panel Display:

• Input 1 status (primary)
• Input 2 status (secondary)
• Active source indicator
• Fault/alarm indicators
• Load level indication
• At-a-glance monitoring

Visual Monitoring:

• Quick status verification
• Fault identification
• Source quality indication
• Operational confirmation
• Troubleshooting aid

Audible Alarms

Alert System:

• Source failure alarm
• Transfer event notification
• Fault condition alerts
• Overload warnings
• Configurable alarm settings
• Silence capability

1U Rackmount Design

Space Efficient:

• Standard 1U height (1.75″)
• 19-inch rack compatible
• EIA-310 compliant
• Minimal rack space usage
• Professional appearance
• Efficient rack utilization

Mounting:

• Standard rack rails
• Toolless installation options
• Front-facing controls
• Rear power connections
• Cable management friendly

Protection Features

Comprehensive Safeguards:

• Overload protection
• Short circuit protection
• Voltage monitoring
• Frequency monitoring
• Surge suppression
• EMI/RFI filtering
• Thermal protection

Ideal Applications

Data Centers:

• Server racks
• Network equipment racks
• Storage systems
• Critical infrastructure
• Colocation facilities
• Enterprise data centers

Server Rooms:

• Small/medium business servers
• Departmental servers
• File servers
• Application servers
• Database servers
• Virtualization hosts

Network Infrastructure:

• Core network switches
• Distribution switches
• Routers and firewalls
• Load balancers
• Network security appliances
• Wireless controllers

Telecommunications:

• PBX systems
• VoIP servers
• SIP trunks
• Call center equipment
• Telecom switches
• Gateway devices

Critical Infrastructure:

• Security systems
• Access control
• Video surveillance
• Building management
• Industrial control
• SCADA systems

Why Choose APC AP4421 ATS

1. APC proven reliability
2. Sub-10ms seamless transfer
3. Dual redundant inputs
4. 16A / 3.6kW capacity
5. 8 IEC C13 outlets
6. Network management ready
7. 1U space-efficient design
8. Automatic + manual modes
9. Enterprise-grade performance
10. Eliminates single point of failure

Redundancy Scenarios

Scenario 1: Dual UPS Configuration:

• Input 1: UPS A
• Input 2: UPS B
• Both UPS units powered by separate circuits
• Maximum redundancy
• Protected against UPS failure

Scenario 2: Utility + Generator:

• Input 1: Utility power
• Input 2: Generator
• Automatic generator backup
• Extended runtime capability
• Grid failure protection

Scenario 3: Dual Power Circuits:

• Input 1: Electrical Panel A
• Input 2: Electrical Panel B
• Separate circuit breakers
• Circuit-level redundancy
• Maintenance flexibility

Installation and Setup

Installation Process:

1. Mount in 19-inch rack
2. Connect Input 1 (primary source)
3. Connect Input 2 (secondary source)
4. Connect equipment to outlets
5. Power on and verify operation
6. Configure network management (if applicable)
7. Set transfer parameters
8. Test failover operation

Best Practices:

• Use independent power sources
• Verify voltage compatibility
• Size for maximum load
• Install network management
• Document configuration
• Test regularly
• Label inputs clearly

Power Source Requirements

Input Specifications:

• Voltage: 230V AC
• Frequency: 50/60 Hz
• Current: Up to 16A per input
• Connection: IEC C20 or hardwired
• Sources must be independent
• Phase compatibility required

What’s Included

• APC AP4421 Automatic Transfer Switch
• Rack mounting hardware
• User manual
• Warranty documentation
• Network management port (for optional card)

Network management card sold separately

Dimensions & Specifications

Physical:

• Height: 1U (1.75″ / 44mm)
• Width: 19 inches (482mm)
• Depth: Varies by model (~16-20″)
• Weight: Approximately 5-8 lbs
• Rack units: 1U

Environmental:

• Operating temperature: 0-40°C
• Storage temperature: -15 to 65°C
• Humidity: 0-95% non-condensing
• Altitude: Up to 3000m

Warranty & Support

• APC standard warranty (typically 2 years)
• Global support network
• Technical support
• Firmware updates
• Replacement parts availability
• Service and maintenance

Maintenance

Regular Maintenance:

• Periodic transfer testing
• Visual inspection
• Connection verification
• Load monitoring
• Firmware updates
• Event log review
• Source quality monitoring

Compliance & Standards

Certifications:

• CE marked
• UL/cUL listed
• RoHS compliant
• Safety standards compliant
• EMC compliance
• International standards

Enterprise-grade automatic transfer switch for mission-critical redundancy – the APC AP4421 delivers dual 230V inputs with sub-10ms automatic failover, 16A/3.6kW capacity, 8 IEC C13 outlets, and network management capability in a 1U rackmount design, providing the essential power source redundancy required for data centers, server rooms, and critical infrastructure to eliminate single points of failure and ensure maximum uptime for rack-mounted servers, networking equipment, and telecommunications devices!