Scope
This information refers to silver tin
oxide wires, profiles and contact tips
manufactured by blending of silver
and metal oxide powder (SP) or with
additives (SPW), compacting, sintering,
extruding and drawing or rolling to
final dimensionaProfiles and tips are
available with a backing layer of silver
and optionalLy with an additional layer
of a brazing ahoy.
DESIGNATION OF
STANDARD COMPOSITIONS
The silver content is designated by the
first number e.g. Ag/Sn02 88/12 with
88 wt.-% silver, balance metal oxides.
The typical graduation of the latter are
8, 10 and 12. Additives improve the switching
behaviour of the different materials.
Applications
- contactors
- automotive relays
- powerline relays
- miniature circuit breakers
- switches for domestic applications
CHARACTERISTICS
- best anti-welding properties on make of
all silver metal oxide variants up to
currents of 5000A ( increasing with higher
oxide content)
- lowest erosion rate of all silver metal oxide
materials of currents exceeding 100 A
- significantly less material migration
compared to Ag/CdO and Ag/ZnO
- low contact resistance comparable to other
silver-metal oxides
- special additives keep the contact resistance
stable throughout the service life
- excellent arc extinguising properties,
better than Ag/CdO for currents upto 70 A
- free of toxic and carcinogenic components
MICROSTRUCTURE
The micron sized Sn02 particles are oriented slightly
along the direction of extrusion.
Longitudinal Sectional
Ag/SnO
2 92/8 SPW
Longitudinal Section
Ag/SnO
2 88/12 SPW
Cross Sectional
Ag/SnO
2 88/12 SPW
Physical Properties
| Material |
Ag/SnO2 92/8 SPW |
Ag/SnO2 90/10 SPW |
Ag/SnO2 88/8 SPW |
| Density [g/cm3] |
10.1 |
10.0 |
9.9 |
| Electrical Conductivity [m/(Ω.mm2)] |
48 |
47 |
45 |
| Hardness Soft [HV1] |
57 |
62 |
67 |
| Tensile Strenght Soft[Mpa] |
225 |
230 |
235 |
| Elongation [%] |
32 |
30 |
28 |
