Reed Switch:
Working
When two solenoid coils are connected in series addition and when excited/energized the flux produced by both coil is added and it produces operating force on reeds and the contacts are closed.
When coils are de-energized contact returns to original position due to spring action of reed itself – no separate spring is required.
Advantages
Very low contact resistance, hence negligible voltage drop
Due to inert gas, no corrosion of contacts
Long Life
Weight of moving part is negligible hence high operating speed as compare to electromagnetic relays
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