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For ELECTRIC MACHINE AND TOOL ELECTRICAL CONTACT POINT PARTS

ELECTRICAL CONTACT POINT PARTS
Nippon Tungsten is selling electrical contact point parts as a trade name, ELECTRO-METAL,"EM".

The electrical contact point parts include weak electrical switches for turning ON and OFF at low voltage and small current and strong electrical switches for breaking a circuit at ultrahigh voltage and large current. Furthermore, they include those used under various conditions such as in air, oil, various gases, and vacuum. We are producing many kinds of EM products according to the applications of various switches.

EM-C

EM-C is a composite alloy of copper and tungsten produced by powder metallurgy, containing from 10 to 70 weight percent of copper. This product is usually used for contact points of switches and circuit breakers filled with oil or SF6 gas.

EM-S

EM-S is a composite alloy of silver and tungsten produced by powder metallurgy, containing from 20 to 70 weight percent of silver. This is usually used for contact points of switches and circuit breakers filled with oil or SF6 gas. This product has good reputation as arcing contact point materials for circuit breakers, molded-case circuit breakers (MCCB) for intermediate loads and as contact points of materials for electromagnetic circuit breakers.

EM-HS

EM-HS is a composite alloy of silver and tungsten carbide produced by powder metallurgy. The tungsten carbide is a very hard material to be used for raw materials of cemented carbide, normally containing from 40 to 70 weight percent of silver. EM-HS is used more often for contact points of molded-case circuit breaker and electromagnetic switches because it has more stable contact resistance than EM-S. EM-HD, whose contact resistance is decreased and seizure resistance is improved, has a good reputation as fixed contact points for molded-case circuit breakers.

EM-N

EM-N is a composite alloy of silver and nickel produced by powder metallurgy, containing from 60 to 90 weight percent of silver as a standard. Because of high mechanical strength, this product is often used for main contact points of air circuit breakers having arcing contacts. In the case of molded-case circuit breakers, this product is used in combination with EM-GS.

EM-GS

EM-GS is a composite alloy of silver and graphite produced by powder metallurgy, containing from 97 to 99 weight percent of silver as a standard. EM-GS has many applications as a contact point not to get hot because of its excellent seizure resistance and low contact resistance. Furthermore, because it can slide, this product is effective to prevent from galling on a sliver-plated surface; theretofore, is used for main contact points of air circuit breakers whose application is critical due to sliding.

EM-OD

EM-OD is a composite alloy of various oxides produced by an internal oxidation method. This is a cadmium-free product, used for contact points of circuit breakers and switches to be used under intermediate loads.
* Please contact us separately for the products of copper-tungsten carbide and other materials having different composition.

* Bonded products: Electrical contact point parts are rarely used individually and usually bonded to a metal base made of copper, brass or iron. Nippon Tungsten is supplying those products after directly bonding them by brazing, NDB method and rotary friction bonding.

Inquiry

OVERSEAS SALES PROMOTION OFFICE
  • TEL +81-942-50-0053 / FAX +81-942-50-0054
Nippon Tungsten Co., Ltd.
2-8, Minoshima 1-chome, Hakata-ku, Fukuoka, 812-8538 Japan
Phone TEL +81-942-50-0053 / FAX +81-942-50-0054
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