float switchs

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hey guys how does a float switch actually work ps i know when the water level drops the floating white thing drops but what happens next inside the float switch to allow it to close the circuit?
 
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Hi Mike.The float is magnetic and the contacts inside the centre shaft are activated by it(pulled together) when the float passes them
 
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Mike,

Float switches are designated as either having normally open (NO) or normally closed (NC) contacts or a combination of both ( change-over switch)depending on whether the float switch will actuate only an alarm or in the case of a auto-top up it will actuate a pump.
As the float moves up or down it will either close or open the contacts, thereby actuating an alarm, pump or whatever function you desire it to perform.

Hope this answers your question
 

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