What Are the Functional Differences Between AC22A and AC23A Isolator Operations?

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Discussion Overview

The discussion focuses on the operational functionalities of AC22A and AC23A isolator ratings, particularly their differences in handling various types of electrical loads. Participants explore the implications of these ratings in practical applications, including the theoretical underpinnings of their design and usage.

Discussion Character

  • Technical explanation
  • Debate/contested

Main Points Raised

  • Some participants suggest that the primary difference between AC22A and AC23A is related to their ratings, with AC23A being designed for more highly inductive loads.
  • One participant notes that AC23A may involve differences in contact size, material, and arc quenching apparatus compared to AC22A.
  • Another participant seeks clarification on why AC23A has a different current rating and the theoretical rationale for the existence of different duty ratings in isolators.
  • There is mention of a power factor difference, with AC22A having a power factor of 65% and AC23A at 35%, suggesting that AC23A is suited for more severe duty at reduced current.
  • Participants discuss the potential for manufacturers to assign multiple AC duty ratings to their devices, which may affect current ratings and operational capabilities.
  • One participant raises a question about the effects of interrupting current in inductors, highlighting the challenges faced by contacts in such scenarios.

Areas of Agreement / Disagreement

Participants express some agreement on the basic definitions and operational contexts of AC22A and AC23A, but there remains uncertainty regarding the specific reasons for their differing current ratings and the theoretical foundations for these distinctions.

Contextual Notes

Participants reference external documents for definitions and specifications, indicating that the discussion may depend on the interpretations of those documents. There are unresolved questions about the implications of inductive loads on contact performance and the specific design choices made by manufacturers.

nisham
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Dears,

Can anyone brief what is the operation functionality of AC23A operation of isolators & what is the difference between AC22A & AC23A operation.
 
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It would seem it's just a difference in ratings, AC23 being robust enough for more highly inductive loads.

http://www.hevacomphelp.com/ELEC/1pdf/MCP/0001.PDF
DEFINITIONS OF UTILIZATION
CATEGORY
AC20A Connecting and disconnecting
under no load condition.
AC21A Switching of resistive loads
including moderate overloads.
AC22A Switching of mixed resistive
and inductive loads including
moderate overloads.
AC23A Switching of motor, or other



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
http://www.gil-lec.co.uk/custom/upload/pdfs/circuit%20protection/Hager_Isolators_Switches.pdf

and suggests that a given switch may be used for more severe duty at reduced current
Manufacturers may assign more than one AC duty rating to their
devices. For example an AC22 switch can be given a lower
current rating when assigned to AC23 duty. Manufacturers may
also assign a maximum kW power rating for motors or a kVAr
reactive power rating for capacitors.


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:
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.
 
nisham said:
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 reahttp://www.gil-lec.co.uk/custom/upload/pdfs/circuit%20protection/Hager_Isolators_Switches.pdfson behind introducing such different duties in isolators.


again, http://www.gil-lec.co.uk/custom/upload/pdfs/circuit%20protection/Hager_Isolators_Switches.pdf
Common types of defined switching category:
• 20 Connecting & disconnecting under no load.
• 21 Switching of resistive loads.
• 22 Switching of mixed resistive & inductive loads.
• 23 Switching of highly inductive loads.

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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