Many people are easy to ignore the knowledge of switch and socket
1. Switch contact
The switch contact is the core part of the switch, and the material is very particular. At present, there are three kinds of contact: silver contact, silver nickel alloy and silver cadmium alloy.
A. Silver cadmium alloy and silver nickel alloy: cadmium and nickel are heavy metals. On the one hand, they are harmful to human body, and on the other hand, their fusion with silver is not ideal. They will form small cadmium particles on the contact surface, which may cause electric arc when conducting electricity.
B. Silver contact: at present, it is an ideal contact material, widely used in the production of electronic appliances, such as switches, relays, and the intersection fulcrum of conductive lines. The switch socket of JUNON electric appliance adopts silver contact, which can increase the frequency of use of conductor, increase the contact effect and enhance the performance of conductor.
2. Copper pieces
Copper pieces material is the main factor to determine the performance of copper pieces.
Before the advent of composite materials, pure copper was indeed the best conductive material, with the best performance of red copper, followed by red copper and the worst brass. But copper has its inherent defects, one is soft, the second is low toughness, rebound performance is not particularly excellent, in addition, it is easy to oxidize and rust. Of course, compared with the current popular Tin Phosphorus Bronze, these properties of Tin Phosphorus Bronze are better than pure copper, especially the remarkable improvement of oxidation resistance, hardness and toughness. Generally, the shrapnel made of Tin Phosphorus Bronze can easily reach 50000 times or more by repeatedly pulling and inserting, and some of the good properties can even double
3. Luminous LED indication
The difference between LED indicator switch and traditional night light indicator: at present, there are three kinds of switches in the market: neon bubble indicator, LED indicator and fluorescent bar indicator
A. Neon bubble indicator lamp: it is indicated by electric light source with obvious effect, but the current is too large, about 500 μ a, and it will cause stroboscopic phenomenon of fluorescent lamp.
B. LED indicator light: it belongs to electric light source, with good effect, but the price is on the high side, and the poor LED light source driving power supply will cause stroboscopic phenomenon.
C. Fluorescent bar indication: it mainly uses the energy storage chemical substances to light up, with good indication effect. In addition to the function of aesthetic degree, it can also give out low light through the fluorescent function at night to indicate the position; in the dark, it can also see where the switch is, which is convenient to turn on and off the light at night.