This refers to the part in relays and temperature regulators that turns on and off the electric current by making and breaking the contact of conductors. Because the contact part is easily damaged by the arc that occurs when cutting off the electric current, the material must be a good conductor of electricity and heat, have low contact resistance, high melting and vaporization points, be resistant to deterioration by oxidation, and be hard and resistant to wear. Usually, platinum, gold, silver, tungsten, copper, nickel, etc., or alloys of suitable combinations of these are used. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
継電器 (リレー) や温度調節器などで導体の接触,離脱により電流を断続させる部分をいう。接点部は電流を切る際に生じるアークによって損傷しやすいので,その材料には電気および熱の良導体で接触抵抗が小さく,融点および気化点が高く,酸化による変質が少く,かつ,硬くて摩耗しないものが要求される。普通,白金,金,銀,タングステン,銅,ニッケルなど,またはそれらを適当に組合せた合金が用いられている。
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