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Vertiv Liebert STS2-PDU
Static Transfer Switch-Power Distribution Unit


Vertiv Liebert STS2-PDU

Veriv Products
Liebert STS2/PDU
Vertiv Liebert STS2-PDU 250 Amp
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Vertiv Liebert STS2-PDU 400 Amp
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Vertiv Liebert STS2-PDU 600 Amp
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Vertiv Liebert STS2-PDU 800 Amp
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Overview:

Best Suited For:
  • Banking, Financial and Insurance
  • Data Center/Colocation/Hosting
  • Education
  • Healthcare
  • Retail and Wholesale

Provides power distribution and automatic switching between two different AC power sources such as different UPS systems.​​ The Liebert STS2-PDU from Vertiv is making it easier to protect your critical equipment by giving your single cord loads the reliability of dual cord power or by providing added redundancy to your dual cord devices. With a single, space-saving unit, the Liebert STS2-PDU static transfer switch/power distribution unit provides power distribution and automatic switching between two different AC power sources. The Liebert STS2-PDU is available in 250A, 400A, 600A and 800A systems, in both 60Hz and 50Hz. Multiple input voltages are available. Designed for use in dual-bus power applications, this solution combines fast switching between AC power sources, power isolation, distribution, monitoring and grounding into a single package.

An All-In-One Power System With A Smaller Footprint And A Smaller Price Tag

Liebert is making it easier to protect your critical equipment by giving your single cord loads the reliability of dual cord power or by providing added redundancy to your dual cord devices. With a single, space-saving unit, the Liebert Static Transfer Switch 2/Power Distribution Unit provides power distribution and automatic switching between two different AC power sources.

Critical Power Distribution and Switching Made Easy

This is why Liebert designed the STS2/ PDU — to bring you a distribution system that will close the power delivery loop in your critical facility. Liebert STS2/PDU offers the benefits of a custom-tailored power system, with the convenience and cost savings of a pre-packaged, factorytested unit. Housed in a single, selfcontained cabinet, it combines distribution, computer-grade grounding, isolation, and power monitoring, as well as dual-source switching, to provide the protection your vital computer or communications equipment demands. Available in 250 – 800 A capacity systems, the Liebert STS2/PDU offers flexible expansion capabilities to fit growing sites.

A Proven System

The packaged system approach of the Liebert STS2/PDU is convenient and space-saving, reducing installation time and cost compared to a conventional approach using multiple interconnected components. The Liebert STS2/PDU is built on proven system designs used in thousands of installations. And unlike the one-of-a-kind, built-up distribution constructed at the site, it undergoes thorough factory testing as a complete system to assure reliable, consistent performance.

A Reliable Choice for Critical Equipment Protection

A number of integral features allow Liebert STS2/PDU to provide a higher quality level of electrical power for your critical applications:

  • Dual AC Input and automatic or manual switching capability boost the availability of reliable power to the protected single-source equipment.
  • The main input breaker provides primary transformer overcurrent protection and a power disconnecting means.
  • Built-in transformers eliminate harmonic neutral currents, which are possible with building wiring systems.
  • Double-shielded isolation transformers located close to the load provide superior noise attenuation.
  • Power Distribution:
    • A single output breaker
    • Or, up to four individually enclosed 42 pole output panel boards with panel board main breaker and individual isolated neutral and ground bus bars distribute power to the sensitive load equipment.
    • Or, I-Line Panelboard with up to 10 circuit breakers for distribution to loads, with separate isolated neutral and ground bus bars.
  • Oversized neutral components safely withstand neutral currents of at least 1.73 times full load currents.

A Reliable Choice for Critical Equipment Protection

Designed From The Ground Up For Effective Power Protection

Liebert STS2/PDU is designed with proven-effective Liebert components, combined into a package that greatly improves power quality while saving valuable floorspace.

Computer Grade Grounding
Liebert STS2/PDU establishes a single point ground for the critical load. Power ground and computer ground points are identical, minimizing ground-loop currents and common mode disturbances. Short output cables maintain the integrity of the isolation and conditioning.

Non-Linear Load Compatibility
Liebert STS2/PDU is designed to accommodate moderate levels of harmonic currents. Where severe levels of harmonic currents are anticipated, K-Factor transformers for harmonic current cancellation are available.

Secure Distribution And Circuit Identification
Distribution panels are in the computer room, limiting access to authorized personnel only. Each breaker has an adjacent identification tag for rapid circuit ID.

Dual Input Source for Single Input Loads
The internal solid-state bus transfer switch automatically or manually switches to the second AC source in the event of a power failure, providing true dual source protection for single input equipment.

True Internal Redundancy
In addition to the redundancy provided by the dual internal transformers, the transfer switch itself has triple-redundant logic. Each DSP controller is capable of working independently, and each helps monitor the other two. If one malfunctions, the other two lock it out. Each controller has power feeds from both power supplies.

On-Site Power MonitoringOn-Site Power Monitoring
The integral power monitoring panel provides comprehensive metering and alarms for system power parameters. The color touch-screen LCD monitor has easy to understand pop-up menus, with a wealth of operational and diagnostic information. Monitoring features include:

  • True RMS measurements
  • Adjustable alarm thresholds
  • Programmable custom alarms
  • Battery-backed alarm memory

Central Monitoring Interface
Liebert STS2/PDU is compatible with our Liebert SiteScan centralized monitoring systems, allowing single point monitoring and alarm of power conditions. In addition, an isolated RS-232 ASCII port is provided for communication of monitored parameters and alarm information to other monitoring systems. Liebert OpenComms NIC interface card can also be used to enable cost-effective monitoring of a Liebert STS2/PDU by your facility or network monitoring system.

A host of options enable you to design the Liebert packaged power system to your exact needs:

  • Up to four, 42 pole panelboards for power distribution to critical equipment.
  • I-Line panelboard with 10 circuit breakers for power distribution to the intended loads.
  • Transient voltage surge suppression (TVSS) is available for increased protection from damaging voltage surges. Very short interconnecting wiring provides superior surgeclamping performance.
  • K20 transformers safely withstand high harmonic currents associated with electronic loads without derating.

Easy Installation And Maintenance In A Compact Footprint

As with all Liebert systems, the Liebert STS2/PDU is a marriage of form and function. In addition to unbeatably reliable power, the unit also saves time with easy installation and routine maintenance while conserving space with its compact package.

Single Cabinet Design

The smart design of Liebert STS2/PDU minimizes installation time while it uses less floorspace. The single cabinet design of the Liebert STS2/PDU is a factory wired and tested, field proven solution requiring less than two thirds the space of traditional built-up systems. This design allows the system to expand with your growth needs, or to easily relocate to a new space if protected equipment is moved to a new facility.

High Efficiency Power Distribution In Far Less Space

Convenient, Fast Maintenance

The Liebert STS2/PDU requires only front, top or side access for installation, operation and maintenance. Any area requiring routine maintenance is accessed through hinged or easily removed panels. The unit is constructed of replaceable subassemblies that can be easily changed by authorized personnel without exposure to high voltage. Nameplates are provided to identify protected devices, for error-free connection and maintenance.

 Liebert STS2/PDU 250A, 600A, 800A

Features and Benefits:

Benefits

  • Operates efficiently
  • Triple redundant logic with dual power feeds
  • Compact single cabinet conserves valuable floorspace compared to non-packaged solutions
  • A choice of distribution options to fit site requirements
  • Grounding automatically establishes a single point ground to meet manufacturer and code requirements
  • Fully compatible with the non-linear loads of modern computer systems and other electronic equipment
  • Standard on-unit monitoring and optional centralized monitoring capability provide continuous system visibility
  • Lowest Total Cost Of Ownership When applied as primary side switching, costs are lower due to requiring only one power distribution unit, a lower current due to 480V vs. 208V, and lower installation and wiring costs
  • Single cabinet design reduces installation time and cost UL listed as complete system

Flexibility

  • Compact single cabinet conserves valuable floorspace compared to non-packaged solutions.
  • A choice of distribution options to fit site requirements
  • Easily relocated when site needs change.

Higher Availability

  • Computer-grade grounding automatically establishes a single point ground to meet manufacturer and code requirements
  • Fully compatible with the non-linear loads of modern computer systems and other electronic equipment.
  • Standard on-unit monitoring and optional centralized monitoring capability provide continuous system visibility.

Lowest Total Cost Of Ownership

  • When applied as primary side switching, costs are lower due to requiring only one power distribution unit, a lower current due to 480V vs. 208V, and lower installation and wiring costs.
  • Single cabinet design reduces installation time and cost.
  • UL listed as complete system.

Standard Features

  • Front and side accessible for installation and service
  • Color touch-screen LCD interface eliminates mechanical pushbuttons
  • Intuitive user interface with drop-down menus and dialog boxes
  • Triple-redundant DSP digital logic
  • Dual-redundant power supplies
  • 100% rated, fuseless design
  • Hot-swappable circuit breakers
  • Flash memory enables firmware updates while supporting critical load
  • CANBUS internal control wiring y Rack-out control/power assembly on units up to 600A, to allow maintenance, service, or full replacement without disrupting the critical load
  • Top and bottom cable entry
  • Dual-lug installation bus
  • UL listed

Optional Features

  • Full range of Liebert Open Comms hardware and software
  • Programmable output relays for custom customer alarms and connections
  • Customizable input relays allow alarms from other devices to be displayed on Liebert STS2/PDU display
  • TVSS
  • Keylock Switch
  • Remote Source Selection
  • Subfeed Breakers

Specifications:

Liebert Static Transfer Switch 2 / Power Distribution Unit Specifications

Amp Rating 250 400 600 8002
Input Voltage 208, 380, 400, 415, 480 or 600 VAC 380, 400, 415, 480 or 600 VAC 380, 400, 415, 480 or 600 VAC 480 or 600 VAC
Output Voltage 208 208 208 208
Heat Output 3.44 kW 5.66 kW 8.57 kW 11.50 kW
Uncrated Dimensions (WxDxH) 73 x 32 x 77 in
1956 x 813 x 1956 mm
73 x 49 x 77 in
1854 x 1245 x 1956 mm
73 x 49 x 77 in
1854 x 1245 x 1956 mm
97 x 49 x 77 in
2464 x 1245 x 1956 mm
Uncrated Weight 3393 lbs
1542 kg
4608 lbs
2095 kg
5692 lbs
2587 kg
8618 lbs
3917 kg
Shipping Demensions1 99 x 44 x 86 in
2515 x 1194 x 2184 mm
79 x 56 x 86 in
2007 x 1422 x 2184 mm
79 x 56 x 86 in
2007 x 1422 x 2184 mm
Module A
48 x 56 x 86 in
1016 x 1422 x 2184 mm
Module B
64 x 56 x 86 in
1626 x 1422 x 2184 mm
Shipping Weight1 3593 lbs
1633 kg
4808 lbs
2185 kg
5892 lbs
2678 kg
Module A
4184 lbs
1902 kg
Module B
4463 lbs
2029 kg
Operating Specifications
Input Voltage 208, 380, 400, 415, 480 or 600 VAC, +/- 10%
Frequency 50 or 60 Hz, +/- 5%
Sense and transfer time 4ms maximum
Overload Capability 125% for 10 minutes,150% for 2 minutes
Operating Temperature 0 to 40° C

Note: 1Shipping dimensions and weight include the pallet and packing material. Actual weights will vary depending on installed options.
2The 800 A ships as 2 modules (shipping split).

Views:


Angle View

Open View

Inside View


Documentation:

Download the Vertiv Liebert STS2 PDU Datasheet (.PDF)

Pricing Notes:

Veriv Products
Liebert STS2/PDU
Vertiv Liebert STS2-PDU 250 Amp
Contact us for Pricing!
Vertiv Liebert STS2-PDU 400 Amp
Contact us for Pricing!
Vertiv Liebert STS2-PDU 600 Amp
Contact us for Pricing!
Vertiv Liebert STS2-PDU 800 Amp
Contact us for Pricing!