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Liebert® STS2

GUIDE SPECIFICATIONS
Automatic Static Transfer Switch
100A - 1000A

  1. GENERAL

    1. SUMMARY


These specifications describe the requirements for an automatic static transfer switch. The Liebert STS2 is a solid-state, three-pole, dual-position transfer switch designed to switch automatically and manually between two synchronized three-phase AC power sources without an interruption of power to the load typically less than 1/4 cycle.

The input power shall be supplied from two different AC power sources, which are nominally of the same voltage level, phase rotation and frequency. The primary purpose of the Liebert STS2 is to allow virtually uninterrupted transfer from one source to the other in case of the 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 backfeeding one source to the other. The Liebert STS2 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 shall transfer without interruption typically in less than 1/4 cycle to the other source, designated as the alternate source. The Liebert STS2 shall be furnished with key-interlocked static switch isolation and bypass Molded-case Switches (MCSs) to each source, which allow uninterrupted manual transfer to and from either source for maintenance.

For Optimized Transfer, the transfer will be within the ITIC/CBEMA voltage quality standard. This is an optional setting which minimizes the resulting downstream transformer saturation inrush current.
    1. STANDARDS


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

  • American National Standards Institute (ANSI)

  • Canadian Standards Association (CSA)

  • Institute of Electrical and Electronics Engineers (IEEE)

  • ISO 9001

  • National Electrical Code (NEC)

  • National Electrical Manufacturers Association (NEMA)

  • National Fire Protection Association (NFPA 70)

  • Underwriters Laboratories (UL)

  • EN 61000-6-4 & 6-2

The Liebert STS2 shall be UL and UL listed per UL Standard 1008 for Automatic Transfer Switches or 1008S for Solid State Transfer Switches

The Liebert STS2 shall comply with the latest FCC Part 15 EMI emission limits for Class A computing devices and the emission limits of EN/IEC61000-6-4Class A.

The Liebert STS2 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 shall comply with the immunity requirements of EN/IEC61000-6-2 Class A.
    1. Definitions


STS - Static Transfer Switch

SCR - Silicon Controlled Rectifier

MTBF - Mean Time Between Failure is the actual arithmetic average time between failures of the critical AC output bus.

Molded-case Switches (MCS) - A circuit breaker that has no automatic thermal overload trip element but does have a magnetic trip element for short-circuit/fault protection. Short-circuit and overload protection must be provided by an upstream overcurrent device.
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