Contact pad designed for a movable electrical contact of a circuit breaker, movable electrical contact having such a pad and circuit breaker comprising such a contact
AssigneeSchneider Elecric Industries SAS
InventorsMarc Rival, Guy Gastaldin, Jean Paul Favre Tissot, Franck Pizot
Life of this patent
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Abstract
Contact pad designed to be fixed on a movable contact of a low-voltage circuit breaker designed to withstand peak short-circuit currents comprised between 200 and 600 amperes per square millimeter of pad. The pad is made of a silver- or copper-based conducting material alloy, a fraction of refractory particles such as tungsten carbide, tungsten or titanium nitride and a fraction of carbon fibers. The weight percentage of carbon fibers in the pad is strictly less than 2% of the total weight of the pad.
Claims7
A contact pad for being fixed onto a movable contact of a low-voltage circuit breaker, the contact pad designed to withstand peak short-circuit currents comprised between 200 and 600 amperes per square millimeter of pad, and comprising:
- an alloy of silver- or copper-based conducting material,
- refractory particles, and
- carbon fibres, the carbon fibres being crushed fibres with a mean length of less than 20 μm, and the carbon fibres being formed by carbonized fibres containing at least 90% carbon, less than 10% nitrogen, 1% oxygen, and less than 1% hydrogen;
- wherein the weight percentage of carbon fibres in the contact pad is less than 2% of the total weight of said contact pad.
Dependencies are inferred from the claim text.