AFCI Breakers

Specific Inspection Topics Electrical Inspections
1

I have been finding recently that AFCI breakers are running about 10 degrees warmer than the rest of the breakers in the panel when I scan them with an thermal imaging thermometer. Has anyone else been finding this as well in the field?

All feedback will be appreciated.

Thanks

Jonathan

2

A longtime known issue.

3

http://www.sea.siemens.com/us//Products/residential-electrical/AFCI/Pages/AFCI-FAQ.aspx?rc=1

Could an AFCI feel warmer than other breakers in the same panel?

An AFCI breaker may feel warmer to the touch than a non-AFCI circuit breaker. This is due to the heat generated from the power supply for the electronics. Siemens AFCI breakers tested in an average ambient temperature of 23° C (73° F) operated at an average temperature of 38° C (100° F.) This is well within the UL Standard 489 Section 7.1.4.1.6 which states - Temperature rises on handles, knobs, and other surfaces subject to user contact during normal operation shall not exceed 60°C (140°F) on nonmetallic surfaces. It is warm enough to detect with the hand, but this heat does not impact the operation of the AFCI.

4

They usually run hotter and it is not an issue.
Tsk,Tsk,you guys and your IR are such worry warts…:slight_smile:

5

This is ok, but is what your looking at thermally…

The bottom right breakers are AFCI.

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6

You will find the same thing true for GFCI breakers and receptacles - not an issue.

7

EVACUATE THE HOUSE…RUN FOR YOUR LIVES…ok…sorry I am just kidding. Yeah they tend to run a little warmer than normal OCPD’s do.,

8

Thank you all.

As always, the feedback is helpful and appreciated.

Thanks

Jonathan