A Hidden Reliability Threat in UPS Static Bypass Switches

  • Document Number

    SPD_SADE-5TNRQ3_EN

  • Type

    White paper

  • Languages

    English

  • Date

    04/16/2010

  • Version

    V1

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  • Document Number

    SPD_SADE-5TNRQ3_EN

  • Type

    White paper

  • Languages

    English

  • Date

    04/16/2010

  • Version

    V1

Description:

IT managers will be surprised to learn that some medium and high power UPS systems on the market today (rated 50 kW and higher) use undersized static bypass switches despite their negative implications. By using a contactor or a circuit breaker in parallel with SCRs, these static bypass switches are able use smaller, less expensive SCRs that are rated to carry less than full load current continuously. This paper shows that the availability of the UPS system is compromised when undersized static bypass switches are employed in the system. The advantages of fully rated static bypass switches are discussed.

Product Ranges:

Symmetra MW

Files for Download

Description:

IT managers will be surprised to learn that some medium and high power UPS systems on the market today (rated 50 kW and higher) use undersized static bypass switches despite their negative implications. By using a contactor or a circuit breaker in parallel with SCRs, these static bypass switches are able use smaller, less expensive SCRs that are rated to carry less than full load current continuously. This paper shows that the availability of the UPS system is compromised when undersized static bypass switches are employed in the system. The advantages of fully rated static bypass switches are discussed.

Product Ranges:

Symmetra MW

Files for Download

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