Sourced for enterprise IT teams, the Dell 491CY (491CY - Dell 2000-Watts Non Redundant Power Supply for Tower Server PowerEdge T640) is a Power Supplies component appropriate for new-build, expansion, or warranty-replacement procurement. Technical specifications include power of 2000W, features of Redundant. Typical use cases include in-place upgrades, EOL replacement under existing OEM service contracts, lab/test environments, and refurbished-rebuild programs. Pro Disk Network maintains the 491CY in our enterprise inventory and verifies each unit against manufacturer datasheet specifications prior to listing. Listed compatibility: Tower Server PowerEdge. Cross-verify against the OEM compatibility matrix before deployment for production workloads. New stock ships factory-sealed where available; refurbished units are tested under load before dispatch and ship with a 90-day Pro Disk Network functional warranty. Same-day dispatch on in-stock orders placed before 3pm ET; free standard ground shipping on US orders over $150.
The 491CY is a Dell power supplies component with power 2000W, features Redundant. Pricing on the 491CY is quote-based — email sales@prodisknetwork.com or use our live chat for a quote within one business day.
The 491CY is a Dell power supplies part. Email sales@prodisknetwork.com with your system make, model, and serial number - we will confirm compatibility and ship same-day if in stock.
How fast does the 491CY ship?
491CY orders placed before 3 pm ET ship the same business day from US warehouses. Delivery is next business day to most metro ZIPs via FedEx/UPS overnight; ground delivery covers remaining US in 1-4 business days.
The 491CY is deployed by US enterprises, MSPs, government, and education customers across multiple infrastructure scenarios. Below are the most common deployment patterns Pro Disk Network sees in real-world orders.
Rack PDU Replacement — Vertical or horizontal PDUs in cabinet retrofits. Metered or switched models for granular outlet-level control.
Branch UPS — Office or remote site UPS. 1500–3000 VA covers most server-rack mini-deployments with 5–15 minute runtime.
Datacenter UPS Module — Online double-conversion UPS for production server rooms. Match VA rating to total connected load + 30% headroom.
Telco / Battery Backup — DC-powered batteries for telco-class equipment, ISP CPE, and outdoor cabinets. Confirm voltage (-48 V vs +12/24 V).
What is the 491CY?
The 491CY is a Dell server power supply unit with power 2000W and features Redundant, manufactured by Dell. Pro Disk Network ships this part new and certified-refurbished from our US warehouse with same-day dispatch on orders placed before 3 PM ET, backed by a 30-day return guarantee.
Pros & Cons of 491CY
Pros
Lower cost than OEM channel pricing
Matched-pair option for dual-PSU redundancy
Cons
Wattage headroom should be sized at 70-80% sustained load
Cable harness sold separately on certain chassis
OEM warranty does not transfer with refurbished units
Frequently Asked Questions about 491CY
Is the 491CY a genuine Dell part?
Yes. Pro Disk Network sources every 491CY as factory-original Dell inventory. New units arrive sealed in OEM packaging; refurbished units are pulled from decommissioned Dell servers, surface-tested, and re-warranted by Pro Disk Network for 90 days.
Will the 491CY fit my system?
The 491CY is a Dell power supplies part. Email sales@prodisknetwork.com with your system make, model, and serial number - we will confirm compatibility and ship same-day if in stock.
How fast does the 491CY ship?
491CY orders placed before 3 pm ET ship the same business day from US warehouses. Delivery is next business day to most metro ZIPs via FedEx/UPS overnight; ground delivery covers remaining US in 1-4 business days.
What is the warranty on the 491CY?
New 491CY units carry the full Dell manufacturer warranty (typically 1 to 5 years depending on product line). Refurbished and bulk-OEM units include a Pro Disk Network advance-replacement warranty (90 days refurbished). DOA replacement is free within 30 days of receipt.
Do you offer bulk pricing for the 491CY?
Email sales@prodisknetwork.com with the quantity and target ship date for a quote within one business day.
PSU Sizing: Connected Load, Efficiency Curves, and N+1 Redundancy
For N+1 redundancy in a dual-PSU server, both PSUs must be rated to handle full load alone. This is non-negotiable in production: if a single PSU fails and the surviving one is undersized, the system shuts down. The 491CY should be matched in wattage rating to the partner PSU in the chassis; mismatched ratings sometimes work but trigger warnings in the BMC.
AC Input, Phase Balancing, and Datacentre Power Best Practices
Document the 491CY model, wattage, and partner PSU in your CMDB. Power audits typically find one or two undersized servers and one or two over-redundant clusters per rack — both of which waste capacity that could feed additional production load.