Case 1343 ยท Public preview
Loose Package Debris Can Cause Intermittent Relay Contact Resistance
Two relays reportedly exhibited intermittent high contact resistance, although bench values were much lower during analysis.
Electrical testingCareful dissectionSEMEDSContact-surface comparison
What the evidence preview establishes
Loose case-material particles at the contact interface were the most plausible intermittent mechanism. Copper oxide remained credible but would more likely produce persistent resistance.
Why this case matters
When loose debris is a suspected intermittent-contact mechanism, use nondestructive particle-impact noise detection before opening the device. Preserve particle provenance, then measure plating and surface oxides if the symptom persists.
Full evidence reserved for MEMBER and STOREThe complete case includes the evidence sequence, four interpreted figures, alternative explanations, limitations, and practical application guidance.