Cisco PWR-C1-BLANK
Config 1 Power Supply Blank
Product Highlights
Empty power supply slots on your Cisco Catalyst switches aren't just unsightly — they compromise airflow, invite dust ingress, and can expose internal components to electromagnetic interference. The Cisco PWR-C1-BLANK is the official Config 1 power supply blank cover designed to seal unused PSU bays and keep your switch operating within spec.
This simple but essential accessory fits into the power supply slot on Cisco Catalyst switches that use the C1 power supply form factor, including the Catalyst 3850 series. It serves three critical functions: directing cooling air through the chassis for proper thermal management, preventing dust and debris from entering the switch, and containing EMI that could disrupt other equipment in the rack.
The PWR-C1-BLANK requires no tools to install and no ongoing maintenance. When you're ready to add a second power supply for redundancy or increased PoE budget, simply remove the blank and slide in the new PSU module. Whether you're deploying a new switch with a single power supply or replacing a removed PSU, the PWR-C1-BLANK is a must-have accessory for maintaining a clean, compliant, and well-cooled installation.
Features & Benefits
Chassis Airflow Integrity
Open power supply slots disrupt the engineered airflow path inside the switch chassis, potentially leading to hot spots and thermal throttling. The PWR-C1-BLANK seals the bay and directs cooling air through the proper channels, helping maintain stable operating temperatures across all switch components.
Dust & Contaminant Protection
Dust, debris, and other airborne particles can accumulate on internal circuitry and connectors, degrading performance over time. By covering the unused PSU slot, the PWR-C1-BLANK acts as a physical barrier that extends the operational lifespan of your switch hardware.
EMI Compliance & Safety
Blank cover panels prevent exposure to hazardous voltages and currents inside the chassis and help contain electromagnetic interference. This is essential for maintaining regulatory compliance and protecting adjacent equipment in dense rack environments.
Tool-Free, Zero-Maintenance Design
The PWR-C1-BLANK installs in seconds without any special tools or technical expertise. It is a passive component that requires no maintenance and is designed to last the full service life of the switch. When a power supply upgrade is needed, simply remove the blank and set it aside for future use.
Deployment Scenarios
Single-PSU Switch Deployments
When a Catalyst switch is ordered with only one power supply, the second PSU bay ships empty. The PWR-C1-BLANK fills that slot to maintain proper airflow and protect internal components until a redundant power supply is added.
Power Supply RMA or Removal
If a power supply module is removed for replacement, RMA, or redeployment, the PWR-C1-BLANK should be installed immediately to seal the open bay. This prevents dust accumulation and maintains EMI containment while the slot is vacant.
Spare Parts Inventory
IT teams managing large Catalyst switch estates should keep PWR-C1-BLANK units in their spare parts inventory. Having blanks on hand ensures that any switch with a removed or failed PSU can be properly sealed without delay.
General
Compatibility
Physical
Compatibility Notes
The PWR-C1-BLANK is designed for Cisco switches that use the Config 1 (C1) power supply form factor. Based on Cisco documentation, compatible platforms include:
- Cisco Catalyst 3850 Series (WS-C3850-xx models)
- Cisco Catalyst 9300 Series (C9300-xx models)
The PWR-C1-BLANK is also referenced alongside Catalyst 3650 series switches in Cisco power supply tables. It is not compatible with switches that use the C2 power supply form factor (e.g., certain Catalyst 3650 models that use PWR-C2-xxx supplies). Always verify your switch's power supply form factor before ordering.
Downloads & Resources
Frequently Asked Questions
| Part Number | Product | Key Difference |
|---|---|---|
| PWR-C1-350WAC | 350W AC Power Supply (C1) | Active 350W AC power supply module for the C1 slot — replaces the blank when power is needed. |
| PWR-C1-715WAC | 715W AC Power Supply (C1) | Active 715W AC power supply for higher PoE budgets — installs in the same C1 slot the blank covers. |
| PWR-C1-1100WAC | 1100W AC Power Supply (C1) | Active 1100W AC power supply for full PoE+ deployments — maximum wattage option for the C1 bay. |
| PWR-C2-BLANK | Config 2 Power Supply Blank | Blank cover for the C2 power supply form factor — NOT interchangeable with the C1 blank. |