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Full Description

NEMA AB 4-2017 sets forth, for use by qualified personnel, a number of basic procedures that may be used for the inspection and preventive maintenance of molded-case circuit breakers used in industrial and commercial applications rated up to and including 1,000 V 50/60 Hz ac or ac/dc.
 

Document History

  1. NEMA AB 4-2023


    Guidelines for Inspection and Preventive Maintenance of Molded Case Circuit Breakers Used in Commercial and Industrial Applications

    • Most Recent
  2. NEMA AB 4-2017

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    Guidelines for Inspection and Preventive Maintenance of Molded Case Circuit Breakers Used in Commercial and Industrial Applications

    • Historical Version
  3. ANSI/NEMA AB 4-2009


    Guidelines for Inspection and Preventive Maintenance of Molded-Case Circuit Breakers Used in Commercial and Industrial Applications

    • Historical Version
  4. ANSI/NEMA AB 4-2003


    Guidelines for Inspection and Preventive Maintenance of Molded-Case Circuit Breakers Used in Commercial and Industrial Applications

    • Historical Version