The Reed Switch, also known as Reed Contact or Magnetic Contact, is the ideal component for non-touch switching.
It is most economic switching component, handling loads from signal load up to 250 W in a wide range of applications.
Modified Reed Switch Solutions
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How does a Reed Switch work?
A Reed Switch consists of a pair of ferromagnetic reeds, overlapping at their free ends (contact area) at a very small distance and hermetically sealed in a glass tube. The contact area is plated with contact material such as Ruthenium or Rhodium. In presence of a magnetic field the reeds become magnetized the opposite polarity, thus attracting each other and closing contact.
Different forms of Reed Switches
Normally open, Reed Switch will close contact in presence of a magnet.
Normally closed. Either achieved by using a Form C switch with the NO wire cut off or by using an attached magnet (requires pole oriented actuation).
Change over, Reed Switch will change from NC to NO contact in presence of a magnet.
Latching type. Switching status remains stable after a magnetic field disappears until a magnet with opposite polarity approaches.
Reed Switch advantages
- No power supply required
- Contacts hermetically sealed
- Most economic non-touch switching solution
- Not ESD sensitive
- Various methods of actuation possible
- Magnetic and electrical pole independent
- Non-touch actuation permits smooth surfaces and
- modern design
- Various sensitivity ranges available