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How do I know what reed switch to select?

There are several key factors:

  1. You need to have an idea of the required load.  What voltage and current is being switched at the time of closure for the first 50 nanoseconds?
  2. How many operations will be required during the life of the product?
  3. What are the size requirements?  How much room is needed?
  4. How will the product be mounted? Surface mount, thru hole, etc.
  5. For long life and low levels, use a ruthenium or an iridium sputtered/plated switch.
  6. For switching applications from 50 Volts to 200 volts use the Philips/Coto/Comus sputtered ruthenium switch.
  7. For switching currents 25 ma to 1 amp, the KOFU thickly plated rhodium is good along with our KSK-1A35.
  8. For higher voltages above 200 volts  up to 4000 volts at relatively low current use the  OKI ORD2210V.
  9. For voltages above 1000 volts up to 10,000 volts with higher currents use the Hermetic vacuum switches.  This represents a start.  One could write a book on this subject.  Best to find out the exact customer load and run a life test with a few or several reed switches to make the final determination.
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