Contactors-are some noisier than others? - Home Brew Forums

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Old 05-24-2011, 02:27 AM   #1
Jul 2006
Ontario, Canada
Posts: 82
Liked 3 Times on 2 Posts

Hi all,

Just finished wiring the 120v side of my 'Kal-esque' enclosure, and powered it up for the first time.

I have 4 DPST contactors in the box (one as the main shut-off to the box, the other 3 controlling outlets for heating elements)
I have powered up each contractor, and one is a lot noisier than the others. Is it normal for the same model of contactor to have varying levels of 'hum'? Or may this be some indication of mechanical flaw?



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Old 05-24-2011, 02:45 AM   #2
Dec 2010
Bellevue, NE
Posts: 183
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mine do the same, flipping them on and off tends to fix it...
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Old 05-24-2011, 03:46 AM   #3
Sep 2010
Wichita, KS, Kansas
Posts: 339
Liked 16 Times on 16 Posts

Yup, sometimes they'll be loud. Sometimes they won't. It's just the nature of the cheap contactor.
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