How to judge the quality of sockets: Four indicators of internal copper parts

To judge the quality of switches and sockets, experts have summarized a number of methods, all of which are important and are related to quality more or less. But the most important thing is to look at the quality of internal copper parts.

The internal copper parts of sockets include current-carrying parts and plugs, which are the core components for connecting power supply and the key components to ensure smooth current flow and reduce heat generation.

To judge the quality of copper parts, there are four major indicators: thickness, toughness, oxidation resistance and one-piece or riveted. The specific requirements of the four indicators are as follows:

• The thicker the copper sheet, the stronger the ability to pass current, which will reduce the resistance of the copper itself. Generally, superior brands are more than 0.5 mm.
• Strong toughness, especially in the plug part of the socket, that is, the plug. The higher the toughness, the less likely it is to deform. It can withstand frequent plugging and unplugging for a long time, still maintain the appropriate clamping force and plugging smoothly. At the same time, the plug is closely connected with the plug, which is conducive to reducing arc; The number of plugging and unplugging of high-quality brands is at least 40,000 times, and some have reached 80,000 times at the factory standard.
• Oxidation resistance, no rust, reduce the resistance caused by rust and heat generation;
• Few rivets, preferably one-piece copper part, further reduce the fracture of the riveting part and rivet heat.

An important factor influencing these four indicators is the material of the copper parts themselves. In the past, brass was used as the main carrier, but now it has become the end.

Comparing Brass and Tin-Phosphor Bronze for Sockets

In the early days of brass for conduction, it was because of its performance fit, which was the best material at the time. Brass has a bright yellow appearance, excellent conductivity, softer texture, wear-resistance, but not ideal in terms of oxidation resistance and toughness (elasticity). After long-term use of brass, the surface of the copper piece will be oxidized and rusted, and the color will darken, which will increase the contact resistance; after repeated plugging and unplugging, due to the poor toughness of brass, it will be severely deformed, often unable to get electricity, or form arcs due to poor contact, unable to ensure safe electricity use.

Improving Socket Quality: Transitioning from Brass to Tin-Phosphor Bronze

With the emergence of better tin-phosphor bronze materials, it quickly replaced brass and became the mainstream. Tin-phosphor bronze alloy has a purplish red appearance, its biggest feature is its high fatigue strength, very strong elasticity, excellent corrosion resistance and oxidation resistance. Even after long-term use, the surface will not be oxidized and corroded, and the plug and socket will not be deformed, always maintaining a suitable clamping force. Famous brands are basically tin-phosphor bronze, so as to ensure the merchant’s promised 8-12 year service life, and some merchants are confident enough to promise a 20-year warranty.

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