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A power distribution unit (PDU) is a device that takes power from an upstream source and makes it available to several connected devices through multiple outlets. In a server rack, a rack PDU gathers the power cords of servers and other IT equipment into one unit. A PDU distributes power; it does not add electrical capacity to the circuit that feeds it.
What a PDU does
A PDU sits between an upstream source and the equipment it powers. That source is usually utility power or an uninterruptible power supply (UPS). The PDU receives that supply and presents it at several outlets, so each device does not need its own run back to the wall or UPS.
Lenovo Press defines the term this way in its Lenovo 1U Basic PDUs Product Guide: “A power distribution unit (PDU) is a highly reliable, multiple outlet power strip designed to consolidate line cords within the rack and distribute conditioned power from an uninterruptible power supply (UPS) or utility power to servers and other IT equipment.”
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Two parts of that definition matter in practice. The first is consolidation: a rack PDU reduces the number of loose power cords a technician must manage. The second is that the output is shared. Every device on the PDU draws from the same input, so the PDU and the circuit behind it must be rated for the combined load.
#1 Best Overall
- POWER AND CHARGE: This rack mount power strip provides an additional 8 NEMA 5-15 outlets (120V/15A) and features a 6ft (1,8m) long cord so you can plug your devices in while leaving the rack mobile
- 1U RACK DESIGN: Compatible with all 19" server racks 4 inches or deeper, this horizontal-mount power distribution unit fits many network racks and has an integrated power cord; ANSI/EIA RS-310-D standard
- EASY INSTALLATION: This IT-grade rackmount PDU features a rugged steel chassis, LED indicators for ground and surge protection, and lets you control the power state with power and reset switches
- PROTECTS YOUR EQUIPMENT: This rack mountable 8-outlet (120V) power strip features a built-in circuit breaker and reset switch, ensuring a dependable performance of your networking equipment
- THE IT PRO'S CHOICE: Designed and built for IT Professionals, this rack PDU is backed for 2-Years, including free lifetime 24/5 multi-lingual technical assistance
Types of PDU
PDUs are sorted by how much they reveal and control, not only by how many outlets they have. Manufacturers do not use these labels uniformly, so the product specification sheet is the reliable reference for what a given model does.
| Type | What it does | What to confirm before buying |
|---|---|---|
| Basic | Distributes power across multiple outlets with no load readout or remote features. | Lacks the measurement and control features of intelligent models, as described in the Lenovo product guide and Eaton’s rack PDU category page. |
| Metered | Shows electrical load, typically on the unit itself. | Where the measurement is taken. Eaton distinguishes metered input units, which measure at the feed, from metered outlet units, which measure at each outlet. |
| Monitored | Adds network-based visibility into load and status. | Whether monitoring is local or remote, and which values are reported. Terminology differs by manufacturer. See Lenovo’s guide. |
| Switched or managed | Adds on/off control for individual outlets, usually with monitoring. | Whether outlets can be switched remotely, and what network setup is required. Remote power cycling is useful, but it can cut power to live equipment if used carelessly. |
| Automatic transfer switch (ATS) PDU | Moves a single-corded device between a primary and a secondary source if the primary fails or becomes unstable. | Confirm both input sources and the device’s power requirements. Eaton describes this as a specialized redundancy option, not a general replacement for a UPS or facility design. (Eaton rack PDU buying guide) |
| Hot-swappable PDU | Has dual AC inputs and allows manual transfer so that a compatible UPS can be maintained or replaced without interrupting connected equipment, according to Eaton. | Exact product compatibility and the installation instructions for that model. (Eaton rack PDU buying guide) |
Schneider Electric’s rack power distribution range uses a similar set of categories. When comparing models across brands, match the measurement point and control features rather than the marketing label.
Rank #2
- RACK MOUNTABLE: This 1U Rackmount PDU power strip fits 19" standard server racks and cabinets, featuring a 1U horizontal rack mount form factor that ensures compatibility with all 19" server racks.
- 15A Overload Protection Switch: Provides overload protection by interrupting the circuit when the load exceeds the rated current.
- HEAVY-DUTY: The power distribution unit features a heavy-duty construction, meticulously designed with robust components and housed in a durable aluminum alloy casing, ensuring a sturdy and long-lasting performance for reliable power management.
- POWER CORD: The power distribution unit comes equipped with a 6-foot (1.8 meter) 14AWG power cord, providing flexible placement options and extended reach for versatile installation in various settings.
- Commitment: ElecVoztile is dedicated to delivering superior products and outstanding customer service. Should you encounter any issues, please do not hesitate to reach out to us for immediate assistance.
Form factors and mounting
Rack PDUs come in two common physical layouts. Which one fits depends on the rack, the cable routing and the free mounting space.
- Horizontal units are commonly 1U or 2U high and mount in a rack unit space, which uses part of the rack’s usable height.
- Vertical 0U units mount along the side or rear rails and leave horizontal space free for servers. Eaton’s rack PDU buying guide describes both forms.
Exact dimensions and mounting compatibility are model-specific. Measure the rack’s rail depth and confirm that the chosen mount fits before ordering.
Rank #3
- 100-125V/15A Basic Power Distribution Unit (PDU) delivers AC power to data centers, network closets, and other electrically demanding applications
- OUTPUT: 10 Rear NEMA 5-15R Outlets; INPUT: NEMA 5-15P straight plug with 15 ft power cord
- VERSATILE RACKMOUNT OPTIONS: Allows for the PDU to be installed vertically or horizontally
- ADDITIONAL FEATURES: Network-grade plugs and outlets, durable metal housing, and cord retention tray
- 3-YEAR LIMITED WARRANTY (This unit does not provide surge suppression)
How to choose a PDU
Work through these checks in order. Each one narrows the options the next one must satisfy.
- Confirm the electrical input. Match voltage, current, phase and inlet plug to the supply that will feed the unit. Eaton notes that rack PDUs are offered for different voltage environments and plug and outlet configurations.
- Add up the load. Compare the actual power requirements of the connected equipment with the PDU rating, the upstream outlet and the building circuit. Use the equipment’s own power data rather than nameplate estimates where that data is available.
- Match outlets and cord reach. Check outlet type, number, spacing and the length of the input cord against each device and the rack position.
- Choose the mounting form. Decide between 1U/2U horizontal and 0U vertical mounting, and confirm that the rack supports the intended layout.
- Select monitoring or control only if you need it. Basic distribution may be enough for simple setups. Metering helps with load visibility, and switched models allow remote outlet control.
- Follow the model’s installation documentation. Electrical and installation requirements vary by model and market. Involve a qualified electrician when the input, load or wiring calls for it.
No single type is best for every installation. Compare the same set of attributes across candidates: input voltage, current and plug; rated capacity; outlet type and count; form factor; measurement granularity; outlet switching; and whether the setup needs source redundancy.
Rank #4
- 10 NEMA 5-15R Outlets with Long Power Cord: This rack mount power strip provides 10 NEMA 5-15 outlets (15A) and features a 6ft long cord to conveniently plug in devices, keeping the mounting more easily and flexible
- Universal 19-Inch Rack Compatibility: Compatible with all 19-inch server racks 4 inches or deeper, this horizontal-mount power distribution unit fits many network racks and has an integrated 6ft/1.8m power cord
- Fireproof Heavy-Duty Construction: This server rack mountable power distribution unit features whole housing fireproofed construction that will support long-life working performance
- Built-In Circuit Breaker Protection: This rack mountable 10-outlet (AC100-240V) power strip features a built-in circuit breaker and reset switch, ensuring dependable performance of your power equipment and safety for using power
- Industrial-Grade Materials and Design: Features industrial equipment pure copper wire material for high power capacity, industrial-grade metal housing, and cord retention tray for enhanced durability
Common misunderstandings
- A PDU is not extra power. Adding outlets does not raise the supply available to the rack. Overloading a circuit through a PDU is still an overload.
- “Monitored” and “metered” do not mean the same thing everywhere. One vendor’s monitored unit may report more or less than another’s, so check the reported values.
- Remote switching is not a substitute for redundancy. An ATS or dual-input PDU addresses a specific failure mode. A switched PDU lets an operator control outlets but does not supply backup power.
For a general overview of rack and data-center power hardware, Dell’s power distribution units page outlines the same basic functions and selection factors.
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Quick Recap
Best Value
- Heavy-Duty Rackmount Power Solution - Enhance your data center, network server, or computer room with our 1.5U Rackmount PDU Power Strip. Designed to fit standard 19'' racks, this sturdy metal power strip features 8 outlets with individual LED switches, offering superior control for your rack power supply needs.
- Power Distribution Unit - Secure your equipment with our PDU rack mount power strip, equipped with a heavy-duty extension cord (6FT). This 1.5U power strip not only boasts a high electrical rating (AC 15A 125V 60HZ 1875W) but also offers exceptional surge protection, avoiding spike surges and ensuring the safety of your rack mounted power strips.
- Flexible Installation Options - Our rackmount power strip is designed for versatility, offering 2 installation options to fit different angles and setups. Whether you're setting up a server rack power strip in a professional data center or seeking reliable power distribution for your home theater, our PDU power strip adapts to multiple occasions.
- Individually Controlled Outlets - with 8 individually lit switches, allowing precise control over each outlet. This feature, combined with the 6FT durable braided extension cord, makes it an ideal choice for managing power in any professional or home setting, ensuring your rack power strip is both functional and accessible.
- Durable Construction and Protection - Built with heavy-duty metal construction, our 1.5U rack mount power strip is designed for durability and reliability. The metal power strip with individual switches ensures your devices are protected from power surges, spikes, and overloads, making it an essential addition to any rack mount setup.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
