Cisco ISR4300-PWR-DC Full Official Product Description
1. Part Number & Naming Definition
Market Reference Name
Cisco ISR 4300 Series Hot-Swappable -48VDC Power Supply Module
Market SKU:ISR4300-PWR-DC
Official Cisco Spare Part: DC power unit for ISR4331-DC/K9, ISR4351-DC/K9
Naming Breakdown
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ISR4300: Cisco ISR 4300 Integrated Services Router platform
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PWR: Power supply FRU module
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DC: Direct current (-48V telecom grade input)
Core Product Positioning
The Cisco ISR4300-PWR-DC is a hot-swappable DC power supply module designed for Cisco ISR 4331 and ISR 4351 Integrated Services Routers. It converts standard telecom -48 VDC input into stable regulated DC power to feed router mainboard, routing processors, NIM/SM interface modules and internal cooling subsystems. Optimized for carrier, colocation and remote branch sites deployed with traditional telecom DC power infrastructure. This DC variantdoes not support PoE power deliveryfor powered endpoints. It supports single power operation or dual redundant deployment to improve network uptime for mission-critical WAN connectivity.
2. Hardware Compatibility
Supported Router Platforms
Cisco ISR4331-DC/K9, ISR4351-DC/K9
Supported IOS Software
Cisco IOS XE for ISR 4000 Series ISR
Unsupported Platforms
ISR4321 (no factory DC chassis option), ISR4400 series, ISR 4200, Catalyst switches, ASR routers
Important Restriction: DC power configuration cannot support onboard PoE function. PoE modules are prohibited when DC power supplies are installed.
3. Electrical & Physical Specifications
Form Factor
Internal hot-swappable FRU power supply with integrated extraction handle; supports OIR (Online Insertion and Removal)
DC Input Parameters
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Nominal Input Voltage: -48 VDC to -60 VDC (telecom standard)
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Wide operating DC input tolerance range
Output Specifications
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Rated continuous output power: 250W (ISR4331) / 437W (ISR4351)
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Built-in reverse polarity protection
Protection Circuits
Overvoltage protection, overcurrent protection, short-circuit protection, thermal overload automatic shutdown
Front panel status LED indicator for power-good and fault alarm
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
OIR-capable design; power supply replacement without router power cycle or WAN service interruption
Supports dual redundant power deployment to eliminate single power supply failure risk
Power Monitoring & Management
Real-time voltage, current and temperature telemetry via IOS XEshow environmentcommand
Fault alerts sent via console logs, Syslog and SNMP v2c/v3 traps
Electronic serial number accessible for asset lifecycle tracking
Intelligent Thermal Control
Onboard variable-speed cooling fan dynamically adjusts rotational speed based on internal temperature to balance cooling performance and acoustic noise.
5. Typical Enterprise Deployment Scenarios
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Primary or redundant DC power source for ISR4331 / ISR4351 branch routers in telecom central offices
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Remote industrial sites and colocation facilities equipped with -48V DC power infrastructure
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Spare inventory for maintenance and hardware lifecycle refresh of ISR4300 DC router fleets
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WAN edge routing deployments without PoE device requirements
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Carrier-class branch connectivity utilizing traditional 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 ISR4300-PWR-DC DC Power Supply FRU Module
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Hardware installation guide
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Safety and regulatory documentation
DC field wiring cables sold separately
End-of-Life Status
ISR 4300 series routers have reached Cisco End-of-Sale. Hardware spare power supplies remain available via authorized spare channels and second-hand markets. Recommended migration platform: Cisco C8200 Series Integrated Services Routers.
UNSPSC Classification Code
43222617 – Cisco ISR4300-PWR-DC hot-swappable telecom-grade DC power supply for ISR4331 and ISR4351 Integrated Services Routers, supporting OIR and redundant power deployment for carrier and enterprise branch 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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