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Liebert® STS2/PDU

GUIDE SPECIFICATIONS
Static Transfer Switch Power Distribution Unit
250A - 800A

  1. GENERAL

    1. SUMMARY


This specification describes the requirements for a combination automatic static transfer switch and power distribution unit. The Liebert STS2/PDU shall include two isolation transformers connected to a solid-state, three pole, dual-position static transfer switch designed to switch automatically and manually between two synchronized three-phase AC power sources without an interruption of power to the load longer than 4 milliseconds (1/4 cycle). Input, output, bypass circuit breakers and a distribution section shall be included to form an integrated system in a single freestanding enclosure. The system shall be designed with no rear access required for installation and normal maintenance.

The input power shall be supplied from two different AC power sources, which are nominally synchronized, of the same voltage level, phase rotation and frequency. The primary purpose of the Liebert STS2/PDU is to allow virtually uninterrupted transfer from one source to the other in case of failure of one source or by manual initiation for test or maintenance. The switching action shall not connect together the two sources of power that would allow back feeding one source to the other. The Liebert STS2/PDU shall allow for either source to be designated as the preferred source. The switch will automatically transfer to the preferred source and remain so until manually initiated to transfer or until the selected source fails. If the selected source fails, the Liebert STS2/PDU shall transfer without interruption greater than 4 milliseconds (1/4 cycle) to the other source, or to an alternate source. The Liebert STS2/PDU shall be furnished with key-interlocked static switch isolation and bypass breakers to each source, which allow uninterrupted manual transfer to and from either source for maintenance.
    1. STANDARDS


The specified system shall be designed, manufactured, tested and installed in accordance with:

  • American National Standards Institute (ANSI)

  • Canadian Standards Association (CSA)

  • Department of Energy (DOE)

  • Institute of Electrical and Electronics Engineers (IEEE)

  • ISO 9001

  • National Electrical Code (NEC)

  • National Electrical Manufacturers Association (NEMA)

  • National Fire Protection Association (NFPA)

  • Underwriters Laboratories (UL) (ULc)

  • CE Marked

The Liebert STS2/PDU shall be UL and ULc listed per UL Standard 891, Standard for Switchboards. The unit shall also meet Standard for Automatic Transfer Switches UL1008, Standard for Panelboard UL67 and Standards for dry type general-purpose transformers UL1561.

The Liebert STS2/PDU shall comply with EN 60947-6-1, Specification for Low-voltage Switchgear and Automatic Transfer Equipment and IEC 62310, Static Transfer Equipment.

The Liebert STS2/PDU shall comply with the latest FCC Part 15 EMI emission limits for Class A computing devices and the emission limits of EN61000-6-2:1999 Class A.

The Liebert STS2/PDU shall safely withstand without misoperation or damage:

  • Transient voltage surges on either AC power input as defined by ANSI/IEEE C62.41 for Category B3 locations (high surge exposure industrial and commercial facilities)

  • Electrostatic discharges (ESD) up to 10 kV at any point on the exterior of the unit

  • Electromagnetic fields from portable transmitters within 3 ft. (1m) of the unit

The Liebert STS2/PDU shall comply with the immunity requirements of EN50082-2 Class A.
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