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23rd - 27th April, 2012
HANNOVER MESSE 2012
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Electrical Contacts For Low Voltage
:: Silver Graphite AgC 2~5 ::

Small additions of graphite to silver are found to reduce Considerably the welding properties of silver. Silver-graphite Composites exhibit excellent resistance to abrasion and have good self lubrication for sliding contacts application and antiweld properties.

Silver-graphite provides optimized performance in current limiting MCB, MCCB, ACB & ELCB devices. The direction of graphite fibers are perpendicular to the contact surface. The backing surface of the contact is specially prepared by decarburisation (burn – off), as the presence of graphite in the surface makes welding / brazing impossible.

Modison also supply silver graphite with graphite fibre aligned parallel to the contact surface.


Nominal Composition
Graphite (wt. %)
Density g/cm³
Hardness HV 10
Electrical Conductivity % I.A.C.S.
Ag C2
2
9.5
42-45
90
Ag C3
3
9.1
42-44
86
Ag C4
4
8.7
41-43
81
Ag C5
5
8.5
40-42
78

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