Is a noisy / humming GFCI breaker OK?
OK a piece of electrical equipment, like a breaker, should not hum. In fact it indicates that it is not working properly or it is a really poor piece of equipment. Both reasons would be enough for me to replace it with a new and better part.
If it is new you might be able to get a replacement under warranty (usually one year). I really don't accept any argument if someone says &quot;It's supposed to do that&quot;. My reply is &quot;No it's not.&quot; or &quot;You need to show me some documentation that says it is acceptable.&quot;
Good Luck