Dry Reed Switches
 Contact
Form
Form "A" (Normally Open)
Switch contacts will close in the presence of a magnetic field.
 Form
"C" (Single Pole, Double Throw)
Form "C" switches have transfer mode contacts.
When a magnetic field is applied, the common contact will be transferred
from the normally closed (N.C.) contact to the normally open (N.O.)
contact.
Contact Material
Rhodium
Rhodium plated contacts are most popular. They have very stable
characteristics and long life when switching low level to heavy
loads. This is due to Rhodium's high melting point and high hardness.
Ruthenium
Ruthenium's hardness is even greater than that of Rhodium. Ruthenium
contacts have better mechanical wear and heat dissipation characteristics,
yet only when switching low loads.
Because of these characteristics ALEPH has developed a double
plated contact with Ruthenium Oxide over Rhodium or Palladium.
These double plated contacts have very good switching characteristics
from low level to heavy loads.
Application Notes:
- When load conditions induce arcing, mercury may evaporate
from the contact area. This may cause contact welding. Therefore,
these switches should not be used in applications where arcing
cannot be controlled.
- Mercury wetted switches must be operated only within +/- 30
degrees from vertical.
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