Cisco ISR4400-PWR-DC Full Official Product Description
1. Part Number & Naming Definition
Market Reference Name
Cisco ISR 4400 Series Hot-Swappable -48VDC Telecom Grade Power Supply Module
Market SKU:ISR4400-PWR-DC
Applicable Platform FRU: DC power unit for ISR4431, ISR4451-X Integrated Services Routers
Naming Breakdown
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ISR4400: Cisco ISR 4400 Integrated Services Router family
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PWR: Field-Replaceable Unit (FRU) power supply assembly
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DC: -48 VDC direct current telecom input variant
Core Product Positioning
The Cisco ISR4400-PWR-DC is a hot-swappable DC power supply designed exclusively for Cisco ISR4431 and ISR4451-X Integrated Services Routers. It converts standard carrier-grade -48 VDC input into regulated stable DC power to supply the main routing processor, forwarding plane, NIM/SM-X interface modules, storage drives and internal cooling fans. Optimized for telecom central offices, colocation facilities and industrial remote branches equipped with traditional -48V DC power infrastructure. This DC power variantdoes NOT support PoE power deliveryfor powered end devices. It supports single power operation or dual redundant deployment to maximize uptime for mission-critical enterprise WAN and SD-WAN connectivity.
2. Hardware Compatibility
Supported Router Chassis
Cisco ISR4431/K9, ISR4451-X/K9
Supported Operating System
Cisco IOS XE for ISR 4000 Series ISR
Unsupported Platforms
ISR4461, ISR4300 series, ISR4200, Catalyst switches, ASR edge routers
Critical Restriction: PoE-capable interface modules cannot be deployed when DC power supplies are installed.
3. Electrical & Physical Specifications
Form Factor
Internal hot-swappable FRU with integrated extraction handle; supports OIR (Online Insertion and Removal) without router power cycle
DC Input Parameters
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Nominal Input Voltage: -48 VDC ~ -60 VDC
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Built-in reverse polarity input protection
Output Specifications
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Rated continuous output power: 350W (ISR4431), 437W (ISR4451-X)
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High efficiency internal conversion architecture
Built-In Protection Mechanisms
Overvoltage protection, overcurrent protection, short-circuit protection, thermal overload automatic shutdown
Front-panel LED indicators for power-good status and fault alarm notification
Typical Weight
Environmental Operating Parameters
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Operating Temperature: 0°C to 40°C (32°F – 104°F)
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Storage Temperature: -40°C to 70°C (-40°F – 158°F)
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Relative Humidity: 5% – 90%, non-condensing
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Maximum operating altitude: 3,000 meters (9,842 ft)
4. Supported Functional Capabilities
High Availability Operation
Full OIR support; power supply replacement without interrupting WAN data traffic
Supports dual redundant load-sharing power configuration to eliminate single power supply failure risks
Power Monitoring & Management
Real-time voltage, current and temperature telemetry accessible via IOS XEshow environmentcommand
Fault event notifications via console logs, Syslog and SNMP v2c/v3 traps
Electronic serial number readable for asset lifecycle tracking and inventory management
Intelligent Thermal Control
Onboard variable-speed cooling fan dynamically adjusts rotational speed based on internal temperature to balance cooling efficiency and acoustic noise levels.
5. Typical Enterprise Deployment Scenarios
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Primary or redundant DC power source for ISR4431 / ISR4451-X branch routers located in telecom carrier sites
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Remote industrial locations and data center colocation environments utilizing -48V DC power distribution
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Spare inventory for maintenance and hardware lifecycle refresh of ISR4400 DC router fleets
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SD-WAN edge routing deployments without PoE endpoint requirements
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Carrier-class branch connectivity built upon conventional telecom DC power architecture
6. Regulatory & Compliance Certifications
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Safety Standards: UL 60950-1, IEC/EN 60950-1, CSA C22.2 No.60950-1
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EMC Compliance: CE Mark, FCC Part 15 Class A, ICES-003 Class A, VCCI Class A
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Environmental: RoHS 2.0 compliant, WEEE directive compliant
7. Standard Factory Package Contents
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Cisco ISR4400-PWR-DC DC Power Supply FRU Module
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Hardware installation instruction sheet
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Safety and regulatory documentation
DC field wiring cables are sold separately
End-of-Life Status
ISR 4400 series routers have reached Cisco End-of-Sale. Spare DC power supply modules remain available via authorized spare channels and second-hand markets. Recommended migration platform: Cisco C8200 / C8300 Series Integrated Services Routers.
UNSPSC Classification Code
43222617 – Cisco ISR4400-PWR-DC hot-swappable telecom-grade DC power supply for ISR4431 and ISR4451-X Integrated Services Routers, supporting OIR and redundant power deployment for carrier and enterprise branch WAN & SD-WAN routing infrastructure.
Hardware Warranty
Original Cisco factory spare units carry limited manufacturer warranty. Refurbished hardware follows reseller commercial warranty agreements.
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