At present, there are three main types of contacts, silver nickel alloy, silver cadmium alloy and sterling silver.
Silver-cadmium alloy contacts are also better in other aspects, but cadmium is a heavy metal, on the one hand, harmful to the human body, on the other hand, the integration of silver is not ideal, will form small particles of cadmium metal on the surface of the contact, and may pull out an arc when conducting electricity.
Sterling silver as a contact is actually not suitable, the electrical conductivity is really good, but sterling silver texture is relatively soft, but also easy to oxidize (like silver jewelry will turn black for a long time). Soft texture, switch more contacts will be deformed; If oxidized rust, the electrical conductivity will be much worse, the rust point is also easy to heat, and it is easy to burn the contact.
Third, look at the structure. Now are mainly large panel, the appearance and feel are better than the previous thumb type. The biggest problem of the thumb type is that it is easy to get stuck, because the torque is relatively short, the switch action amplitude is relatively small, and the spring is slightly Microsoft or hard, which may cause the switch to get stuck. Two days ago, I saw Gray (don't tell me it is American, if it is American, then I am Martian) out of the so-called reset switch, try to feel harsh, open a look inside is a small roller, press a 1/4 turn, in order to reduce inevitable friction, it is coated with lubricating oil. Imagine how this switch will work six months later when the oil inside is dry.
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