Brochure/Catalogue

for EMR for SSR
Contact material,
Contact materials
Relay modules are used in a wide variety of industrial areas and environments.
The relays must therefore be adapted to the various tasks by
selecting suitable contact materials. The following applies: the load
capacity of the contacts for voltage, current, and power depends
essentially on the material used. To make the selection easier
for you, we have compared the most important
characteristics of the contact materials.
Criteria for the selection of the contact material:
• Welding tendency
• Burn-off resistance
• Contact resistance
• Material migration
• Resistance to harmful gas atmospheres
Material: Silver-nickel (AgNi)
Characteristics:
• Higher welding tendency than AgSnO and AgCdO
• High burn-off resistance
• Lower contact resistance than AgSnO and AgCdO
• Mean material migration
• Low resistance to harmful gas atmospheres
Recommended applications:
• Suitable for low to high resistive and low inductive
loads (solenoid valves, fans, heaters)
• Standard contact material for a variety of relays
• Limited suitable for high inrush currents
• Suitable for loads > 12 V/10 mA or 5 V/100 mA
Material: Silver-nickel ash gold plated (AgNi + 0,15 Au)
Characteristics:
• Higher welding tendency than AgSnO and AgCdO
• High burn-off resistance (gold just storage protection)
• Lower contact resistance than AgSnO and AgCdO
• Mean material migration
• Low resistance to harmful gas atmospheres
Recommended applications:
• Suitable for low to high resistive and low inductive
loads (solenoid valves, fans, heaters)
• The ash gold plating is a storage protection, but
offers no functional improvement to AgNi
• Limited suitable for high inrush currents
• Suitable for loads > 12 V/10 mA or 5 V/100 mA
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EMR = Electromechanical relay
SSR = Solid-state relay
Glossary: Relay modules and Solid-state relays
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Technical appendix/Glossary
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