hopjohn
Silver Face
Seems some of these relays have issues with noise. I've run into one that buzzed. I just replaced it with one that didn't. I bench tested the rest of my stock (and you can do this as well before you install to save the trouble of removing it later) and the only noisy one was the one I already found.
There's nothing to prevent you from using any 120V relay that you choose, as long as coil current is nice and low, and the relay contact rating is as high as possible (I'd want at least 20~25A). I will not be buying any more of the Magnacraft relays, but I've not yet sourced a replacement (the Zettler relay linked at Amazon looks like an OK replacement, but I'm sure there are dozens of possible choices).
FWIW I ordered a couple of the American Zettler AZ2280-1A-120AF, tested each, and both were dead silent. They use all the same size terminals as the Magnecraft part and have the exact same dimensions.