Isolator - AC23A operation


by nisham
Tags: ac23a, isolator, operation
nisham
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#1
Sep19-13, 04:15 AM
P: 2
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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jim hardy
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Sep19-13, 06:52 AM
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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/uplo...s_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.
nisham
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#3
Sep21-13, 05:20 AM
P: 2
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.

jim hardy
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Sep21-13, 08:51 AM
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Isolator - AC23A operation


Quote Quote by nisham View Post
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/uplo...s_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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