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The Mac3 Brand is well known for its float switches and for good reason. Since developing the first float switch in 1971, Mac3 have gone on to develop a comprehensive range of high-quality float switches for use in many different situations. What do Float Switches Do? In simple terms, a float switch is used to monitor the level of a contained liquid, so that a subsequent action can automatically be triggered when the liquid rises or falls within designated levels. For example, to start/stop a pu …