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os708090
Associate
Jordan - Member - New Member

Join Date: Aug 2007
Location: Saudi Arabia
Posts: 25

Isolator Switch Rating

02/10/2009 11:55 AM

hi every body

I have an electric hot plate oven , max ampere is 60A at 3ph 220v system.

the oven is connected to 3 phase power supply by means of isolator switch (on/off)

my question is : it is mentioned on the nameplate of the switch that its current is 60A @ AC23 , and 45A @ AC22, 30A @ AC21 .............. what they mean by AC21,AC22,AC23 ??

best regards
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CJMcGill
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Join Date: Jul 2008
Location: SoCal USA
Posts: 556
Good Answers: 23
#1

Re: Isolator Switch Rating

02/10/2009 6:49 PM

From the link given by Ozzb, the important thing to note is the type of load. Yours switches a resistive hot plate load, which means your switch is able to carry the AC21 value, 30 amps, safely. If your oven draws more than 30 amps, you are exceeding the rated value of the switch.

This is an excerpt from the text:

AC21 Switching of resistive loads including moderate overloads.
AC22 Switching of mixed resistive and inductive loads, including
moderate overloads.
AC23 Switching of motor loads or other highly inductive loads.

Regards, CJM

__________________
 I do not 'know it all', but i will admit that I would like to. CJM
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