Brochure/Catalogue

for EMR for SSR
Contact material,
Contact materials
(Continuation)
Material: Silver-nickel hard gold plated (AgNi + Au)
Characteristics:
• Very low resistance to burn-off
• Lowest contact resistance
• High resistance to harmful gas atmospheres
Recommended applications:
• Suitable for decoupling control inputs and other small resistive loads
• Suitable for loads > 1 V/1 mA and < 30 V/10 mA
• After switching loads > 30 V/100 mA, small powers can no longer be
switched reliably because the hard gold plating has been burned-off.
Only the characteristics of the base contact material AgNi still apply.
Material: Silver-Tin-Oxide (AgSnO)
Characteristics:
• Lower welding tendency than AgNi und AgCdO
• High resistance to burn-off
• Average contact resistance
• Lower material migration than AgNi and AgCdO
• Very low resistance to harmful gas atmospheresn
Recommended applications:
• Suitable for medium to high resistive DC-loads and low up to medium
inductive DC loads due to low material migration. Thanks to the low
tendency to weld, it is also well suited for loads with higher inrush currents
such as lamp loads, light capacitive loads, uorescent tubes, etc.
• Suitable for loads > 12 V/100 mA
Material: Silver-Cadmium-Oxide (AgCdO)
Characteristics:
• Lower welding tendency than AgNi
• High resistance to burn-off
• Average contact resistance
• Lower material migration than AgNi
• Very low resistance to harmful gas atmospheres
Recommended applications:
• Suitable for medium to high resistive and inductive
AC loads, due to high burn-off resistance
• Suitable for loads > 12 V/100 mA
Material: Tungsten (W)
Characteristics:
• Lowest welding tendency
• Very high resistance to burn-off
• Highest contact resistance
• Low material migration
Recommended applications:
• Suitable for loads with very high inrush currents of up to
165A/20 ms or 800 A/200 μs (e.g. lamp loads, capacitive loads,
uorescent tubes, switched-mode power supplies etc.)
• Often used as a pre-making contact in parallel to AgSnO contacts
x
EMR = Electromechanical relay
SSR = Solid-state relay
Glossary: Relay modules and Solid-state relays
W
Technical appendix/Glossary
W.192737920000