What could cause contact failure due to oxide film during microload switching?
ID： FAQE10082E
update:
Answer
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.
Explanation
As a guideline to destroy the oxide film, a load of 48 V or more and 100 mA or more has a cleaning effect.
Countermeasure
- 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.
Quick tips
- 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)
| Product category | Relays Signal Relays |
|---|---|
| Classification | Trouble shootings |
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