| Contact material |
Typical features |
Recommended values for the application range |
|
Au Ag 8 (Gold F)
|
For low-resistance
applications at low load
Low constant contact
resistances
For measuring currents, dry
switching
|
µV - 24 V
µA - 0.2 A
< 5 W
|
|
Rh*
|
For high-resistive applications at low
load
Galvano-technical contact coating in µm range for reed contacts with higher
endurance
|
< 150 V
< 2 A
|
|
Pd Ni*(Ni content 20-50%)
|
Galvano-technical contact coating with
similar features to Rh
Powder metallurgical contacts are also possible
Laminar creep of material
|
< 150 V
<5 A
|
|
Ag*-pure and Ag fine grain (Ni content
0.15%)
|
Most common contact material;
universally applicable
Sulfur sensitive, therefore often flash-golded
Also suitable for alternating current
|
1 V - 150 V
50 mA - 100 A
> 1 W
|
|
Ag Pd* (Pd content 30-50%)
|
Important material in communications
technology
Good burn-up resistance
Sulfur insensitive
Slightly higher contact resistances than with Ag
|
1 V - 150 V
50 mA - 5 A
|
|
Ag Ni (Ni content 10-20%)
|
Important material for inductive
loads
Suitable for make currents up to 50 A
Good burn-up resistance
Low susceptibility to welding
Higher contact resistances than with Ag
|
6 V - 380 V
10 mA - 100 A
|
|
Pd Cu 15
|
For lamp loads in the automotive field
(pulsed operation)
Burn-up resistant, long endurance
Laminar creep of material
Higher specific insulation resistances that are not constant
|
6 V - 24 V
5 A - 20 A
|
|
Ag Cd O (Cd content 8-15%)
|
Material for alternating current
Burn-up resistant
Low susceptibility to welding
|
12 V - 380 V
> 0,5 A
> 10 W
|
|
Ag Sn O2 (Sn content 8-15%)
|
Material for direct and alternating
current
Burn-up resistant
Very low susceptibility to welding
Environmentally friendly (replacement for Ag Cd O)
|
> 12 V - 380 V
> 0.5 A
> 10 W
|
|
W
|
For high make currents (as pretravel
contact)
For higher switching rates
Burn-up resistant, low susceptibility to welding
Subject to corrosion
|
> 60 V
> 1 A
> 50 W
|
|
