Contactors-are some noisier than others?

[Rhino17]

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?

Cheers,

Rhino

 

[rosier9]

mine do the same, flipping them on and off tends to fix it...

 

[bbognerks]

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