Knowledge BaseAug 15, 2026
Relay Troubleshooting Knowledge Base
Typical symptoms and measurement methods for burnt contacts, open coils and low pull-in voltage, with a cross-reference table.
Burnt Contacts
Shows as intermittent engagement or heating; confirm with a continuity test and replace the unit if needed.
Open Coil
Coil resistance should be tens to hundreds of ohms; infinity means open circuit.
Cross-reference
Match rated voltage, contact current and pinout when substituting to avoid damaging the module.