66wv
A switched neutral is a 2 pole breaker with one pole that has a white lead that one ties to neutral bar. The neutral from the pump ties to that pole on the breaker. When you install it doesn't make electrical contact with Bus on that pole. It meets the requirement of 514.11A which states you must simultaneously disconnect all non grounding conducters. Of course a 2 pole(assuming 120v circuit) disconnect could do the same thing. But switched neutral breakers are the most common way in my experience.
