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ASCO Three-source system

ASCO Three-Source Systems are similar to ASCO Two-Source Systems except that a second alternate power source is added to back up the first if that power source fails.

Control logic for selecting between the alternative power sources.Normal, emergency, and/or load circuit breakersProtective relaying (as required)Optional instrument meters for normal, emergency, or load for local monitoring.

ASCO Three-source system
  • Features

    • Banking, Financial and Insurance
    • Broadcast and Entertainment
    • Education
    • Fire/Alarm/Security
    • Government
    • Healthcare
    • Manufacturing
    • Power Generation
    • Telecom
    • Transportation


    • Designs are based on NEMA and UL 891 standards.
    • Optional engine start control logic and/or load control logic.
    • Available up through 4000 amperes using ASCO 7000 series automatic transfer switches. 7ATS, 7ATB, 7ACTS and 7ACTB.

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