Isolator - AC23A operation

  1. Dears,

    Can anyone brief what is the operation functionality of AC23A operation of isolators & what is the difference between AC22A & AC23A operation.
  2. jcsd
  3. jim hardy

    jim hardy 5,460
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    2014 Award

    It would seem it's just a difference in ratings, AC23 being robust enough for more highly inductive loads.

    Was that the question?
    There'll be differences in contact size & material, and in the arc quenching apparatus.

    This link gives power factor of 65% for AC22, 35% for AC23 protection/Hager_Isolators_Switches.pdf

    and suggests that a given switch may be used for more severe duty at reduced current

    If you're looking for construction details , i'd take apart a few from different manufacturers to see how they get around one another's patents.
    Last edited: Sep 19, 2013
  4. Thank you, even i have the same information as you have told. i would like to know what makes the AC23A duty to give a different current rating than other duty. Also what is the theoretical reason behind introducing such different duties in isolators.
  5. jim hardy

    jim hardy 5,460
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    again, protection/Hager_Isolators_Switches.pdf
    Have you ever played with inductors and noticed how the make an arc when you interrupt current?

    That is rough service for a contact - it must be made from something that resists arc welding.

    e = l di/dt
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