What could cause contact failure due to oxide film during microload switching?
The relay may generate an oxide film at the contact point during repeated load switching. However, microload switching cannot break the film by a cleaning effect, which leads to poor contact.
As a guideline to destroy the oxide film, a load of 48 V or more and 100 mA or more has a cleaning effect.
For microload switching, it is recommended to use a plastic-sealed relay that is not susceptible to the operating environment.
Since gold (Au) is not susceptible to oxidation, select a relay that uses gold alloy contacts suitable for microloads.
For more information, fefer to The SOLUTIONS [General-purpose Relay Edition]: case 09 Contact Failure by Carbons.
Select a relay with a contact structure suitable for microload switching.
Ag alloy < Ag < Au-plated (clad) < Au-plated (clad) twin crossbar structure
Select a relay less susceptible to ambient environments.
Flux resistant < Plastic sealed
Relay models: G6J-2P(F)-Y, G6K-2P(F/G), G6S-2(F/G)
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