I really like this float switch. The switch actually has a contact that is not used in a three-pronged plug. This means it can be normally closed and normally opened by simply unplugging and plugging it back in. This was important because I use it in the plumbing chimney to indicate if there is a backup sewer. When the water rises, a float switch trips and hooks up to an alarm circuit (rather than just overflowing the basement bath, which is never used by the sewage above).
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