DO Tactile switch Contacts the Bigger and the Better?
Touch the switch to see the case material first. The main switching brands on the market generally use PC materials, PC materials, also known as bullet-proof plastic, impact resistance, high temperature, easy to change color is very important for the control of electrical switches.
Followed by contacts, the touch switch is the contact point of conductive parts. The size of a contact to see (the bigger the better), two depends on the material.
There are currently three main contacts, silver-nickel alloy, silver-cadmium alloy, and sterling silver. Silver-nickel alloy is the ideal contact material, the conductivity, and hardness are better, and it is not easy to oxidation rust.
Other aspects of silver-cadmium alloy contacts are also better, but it is cadmium belongs to heavy metals, on the one hand, harmful to the human body, on the other hand, silver is not ideal integration, the contact surface will form cadmium metal particles, conductive The arc may be pulled out. In fact, silver contacts do not fit, conductive performance is indeed good, but the texture of silver is relatively soft, and is also very easy to oxidize (like silver jewelry over time will turn black). Soft texture, more contacts on the deformation of the deformation; oxidation rusty, then the conductivity will be much worse, the rust is also easy to heat, it is easy to burn the contact.
Third look Tactile switch structure. Now mainly are large-panel style, appearance and feel better than the previous thumb type. The biggest problem with the thumb type is that it is easy to get stuck because the torque is relatively short, the switching action is relatively small, and the spring is slightly softer or tougher, which may cause the switch to jam.
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