The Liebert Static Transfer Switch2/Power Distribution Unit combines the switching capabilities of the STS2 with the benefits of a power distribution unit. Liebert designed the STS2/PDU to bring you a distribution system that will close the power delivery loop in your critical facility. It offers the benefits of a custom-tailored power system, with the convenience and cost savings of a prepackaged, factory-tested unit. Housed in a single, self-contained 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 capacities from 250 to 800 amps, the Liebert STS2/PDU offers flexible expansion capabilities to fit growing sites. 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. Liebert STS2/PDU Features: - 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.
A look inside the Liebert STS2/PDU
On-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. Is the Liebert STS2/PDU the best PDU for your power needs?
Our engineers can help you select the best Power Distribution Unit for your power needs.
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Liebert STS2/PDU
Static Transfer Switch
The Liebert STS2/PDU offers many benefits: 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.
Ideally Suited For: - Data centers
- Telecommunications
- Industrial process equipment
- Laboratories
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