Question 1

What is a compatible spare power supply for the Catalyst 3750-X series?

Accepted Answer

The compatible spare power supply for the Catalyst 3750-X series is the Cisco PWR-C45-3750X-R or PWR-C45-3750X-R-R, rated at 345W AC. These units are engineered for drop-in replacement to restore full switch functionality.

Question 2

Can I hot-swap a spare power supply on a Catalyst 3750-X switch?

Accepted Answer

Yes. The Catalyst 3750-X supports live insertion and removal of PWR-C45-3750X series power supplies, enabling zero-downtime maintenance when redundant supplies are installed.

Question 3

How do I install a spare power supply in the Catalyst 3750-X?

Accepted Answer

Power down the switch only if not using redundancy, slide the PWR-C45-3750X unit into the rear module bay until it clicks, then reconnect the AC power cord. The switch will auto-detect and power up immediately.

Question 4

What fan modules are available for the Catalyst 3750-X series?

Accepted Answer

The Catalyst 3750-X uses the Cisco FAN-3750X-R or FAN-3750X-R-R hot-swappable fan tray. Each tray contains dual fans with variable speed control to optimize airflow and noise.

Question 5

How do I replace a failed fan on a Catalyst 3750-X switch?

Accepted Answer

Loosen the captive screws on the failed FAN-3750X module, slide it out, insert the new fan tray until it seats, tighten the screws, and verify fan status via the switch front-panel LEDs or CLI.

Question 6

Do Catalyst 3750-X spare parts come with a warranty?

Accepted Answer

Yes. Genuine Cisco spare power supplies and fan modules include a limited lifetime warranty when purchased through Cisco or authorized partners, covering defects in materials and workmanship.

Question 7

What are the power ratings for Catalyst 3750-X spare supplies?

Accepted Answer

Each PWR-C45-3750X-R supply delivers 345W AC output at 100–240V, 50–60Hz. It supports full PoE budget sharing across dual redundant units.

Question 8

How can I verify if my power supply is faulty?

Accepted Answer

Check the status LED on the PWR-C45-3750X: green indicates normal operation, amber signals a fault, and off means no input power. You can also view system logs via CLI show environment all.

Question 9

Is power supply redundancy supported on the Catalyst 3750-X?

Accepted Answer

Yes. You can install two PWR-C45-3750X series units in a single switch to enable N+1 redundancy, ensuring continuous operation if one supply fails.

Question 10

Can I mix third-party power supplies with Cisco spares?

Accepted Answer

We recommend using only Cisco-branded PWR-C45-3750X modules. Third-party units may void warranty, lack certification, and compromise switch stability and performance.

Question 11

What is the MTBF of Catalyst 3750-X power supplies and fans?

Accepted Answer

Cisco PWR-C45-3750X series power supplies have an MTBF of over 200,000 hours; the FAN-3750X module exceeds 150,000 hours under typical data-center conditions.

Question 12

How many spare power supplies and fans should I keep on hand?

Accepted Answer

Maintain at least one redundant power supply and one spare fan tray per critical switch. For larger deployments, keep spares equal to 10% of your 3750-X inventory.

Question 13

Where can I purchase genuine Cisco spare parts for Catalyst 3750-X?

Accepted Answer

Order directly from Cisco’s online store or through Cisco Certified Partners to ensure authenticity, warranty coverage, and timely global shipping.

Question 14

How do I troubleshoot power supply error alarms on a 3750-X?

Accepted Answer

First, verify AC input and LED status. If the LED is amber, reseat the module, check power cables, and review CLI logs with show logging | include SUPPLY for error details.

Question 15

Are fan speed and noise adjustable on the Catalyst 3750-X?

Accepted Answer

Yes. The switch dynamically controls FAN-3750X speed based on internal temperature thresholds. Manual fan tuning is not required or supported.

Question 16

What part numbers do I need to order a full replacement kit?

Accepted Answer

For a complete spare kit, order the PWR-C45-3750X-R (power supply) and FAN-3750X-R (fan tray). Include Cisco ordering codes in your purchase requisition for accurate fulfillment.

Power Supplies & Fans Catalyst

C3KX-PWR-350WAC/2-Catalyst 3K-X 350W AC Secondar y Power Supply

C3KX-PWR-715WAC/2-Catalyst 3K-X 715W AC Secondar y Power Supply

C3KX-PWR-1100WAC/2-Catalyst 3K-X 1100W AC Seconda ry Power Supply

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Questions & Answers

What is a compatible spare power supply for the Catalyst 3750-X series?

Can I hot-swap a spare power supply on a Catalyst 3750-X switch?

How do I install a spare power supply in the Catalyst 3750-X?

What fan modules are available for the Catalyst 3750-X series?