• Model: CHFN120A1CS
  • Description: Eaton CH arc fault / ground fault circuit breaker, All-In-One, 20A, 10 kAIC , Single-pole, 120V, pigtail, 3/4" AFCI/GFCI

I bought two of these breakers and they both behave exactly the same. They both seem to work properly. They shut off when I test them via the button on the breaker as well as trigger a ground fault using a testing tool.

The main thing that concerns me is that when I flip the breakers ON, the LED light quickly blinks just once. According to the instructions it seems like it should blink 3 times very quickly (within the first half second), indicating that the circuit board is protecting on 20amps. (1 blink = "Uncommon", 2 blinks = 15a, 3 blinks = 20a).

I can't seem to find the same instructions I have online for some reason.

Is this a problem? Is it protecting as AFCI and GFCI? Am I misunderstanding the instructions?

Here are the paper instructions, since I can't find a link to them online:

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1 Answer 1


It is not possible for your eyes to see a light bulb turn on and off 60 times per second. Your brain fills in the dark cycle. 3 times in half a second is improbable for a person to detect. If you could blink your eyes fast enough you might be able to detect it.

  • A lightbulb actually "turns off" 120 times per second (or 100 in the rest of the world.) That's quite different from 6 times per second, which is quite visible. Movie frame rates are generally 4 times that fast.
    – Ecnerwal
    Oct 8, 2023 at 13:13
  • But don't take my word for it - download a strobe app on your phone and see for yourself. 6 is easily countable. Without the distraction of watching a movie, 24 is clearly blinking, but too fast to count. Blurring to the point of appearing continuous takes considerably higher rates.
    – Ecnerwal
    Oct 8, 2023 at 13:30

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