Leakage protection should be paid attention to when choosing DC socket
Release time：2019-02-16 Clicks： Click
DC socket must pay attention to these problems when choosing and purchasing, because the leakage protection is a key issue, the safety of use and current control need leakage protection, so it is very important, the following gives you a detailed introduction of this issue.
When the short circuit or serious overload current occurs, the short circuit current crosses the instantaneous tripping setting current value, and the electromagnetic tripper generates enough suction. The armature is sucked and the impact lever is combined to make the hook move upward around the rotating shaft seat and release the lock. The three sub-contacts are separated and the power supply is blocked by the lock under the influence of the reaction spring.
When the line is generally overloaded, the overload current of DC socket can not make the electromagnetic release move, but it can make the thermal element generate the necessary heat, make the bimetal sheet bend upward, urge the lever to make the hook and lock off, break off the main contact and block the power supply.
DC socket is divided into two kinds of packaging: SMT chip packaging and DIP plug-in packaging. In terms of shell materials, PC materials are the best choice for switch sockets of regular brands in the market nowadays, followed by nylon 66, electrolyte powder, ABS and so on. PC material that is polycarbonate, also known as bullet-proof glue, compared with other materials, feel very delicate, touch more texture, and good brightness. Secondly, the impact resistance is strong. A good PC shell can not crack by hammer. The products made of PC material also have the advantages of heat resistance and aging resistance. They are not easily deformed even in high temperature environment. They are especially good for ultraviolet radiation, and will not change color if they are used for a long time. The most important thing is that the flame retardancy of PC material is very prominent, which can endure the ablation of arc for a long time.
Insulation resistance refers to the resistance value of the conductor and insulation departments of the switch. Insulation resistance value should be above 100M; Contact resistance refers to the resistance value between each pair of contacts when the switch is on. Generally, it is required to be below 0.1-0.5. The smaller the value, the better.
DC socket can be applied to:
1. Computer products: cameras, recording pens, etc.
2. Fitness equipment: running machine, massage chair, etc.
3. Medical equipment: sphygmomanometer, thermometer, hospital call system, etc.
4. In the absence of mechanical jump-proof devices, electrical jump-proof devices should be installed.
5. Circuit breaker's chaotic tripping signal circuit should be connected according to "unreasonable error should be reasonable";
6. The warning signal should be installed on the equipment which may present abnormal working condition or malfunction.
7. DC socket spring operating mechanism and manual operating mechanism can be supplied with DC or AC power. DC power is required for electromagnetic operating mechanism.
When choosing DC sockets, we must understand these problems to ensure safe use and no leakage.
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