The civil melting vacuum contactor is usually composed of insulating insulation frame, metal base, transmission crank arm, electromagnetic system, auxiliary switch and vacuum switch tube. When the electromagnetic coil passes through the control voltage, the armature drives the crank arm to rotate to connect the main contact in the vacuum switch tube. After the electromagnetic coil is powered off, the main contact is disconnected due to the action of the opening spring.

①民熔真空开关管是以上封盖、下封盖、金属波纹管和陶瓷管等组成，该真空开关管，外壳采用95瓷绝缘材料制成波纹式的瓷管，它具有爬电距离大、机械强度高、耐热和耐冲击的特点。真空开关管内封装一对动静触头，触头材料采用耐磨且低截流值的Cu－W－Wc，这样在满足开断性能的条件下，减小开断过程中由于截流引起的过电压，提高了真空开关管的使用电寿命。当金属波纹管轴向运动时带动动触头做分合闸动作。

① Minrong vacuum switch tube is composed of upper cover, lower cover, metal bellows and ceramic tube. The shell of the vacuum switch tube is made of 95 porcelain insulating material. It has the characteristics of large creepage distance, high mechanical strength, heat resistance and impact resistance. A pair of dynamic and static contacts are encapsulated in the vacuum switch tube. The contact material is cu-w-wc with wear resistance and low cut-off value. In this way, under the condition of meeting the breaking performance, the overvoltage caused by cut-off in the breaking process is reduced and the service life of the vacuum switch tube is improved. When the metal bellows moves axially, it drives the moving contact to make opening and closing action.

②电磁系统考虑实际吸力特性和反力特性良好配合，以及发挥接触器运行时噪音低、节电的优点，采用直流双线圈由起动和维持两绕组组成，通过辅助开关切换，为了便于用户进行交流电源操作，接触器带有桥式整流装置。

② Considering the good cooperation between the actual suction characteristics and reaction characteristics, and giving full play to the advantages of low noise and power saving during the operation of the contactor, the electromagnetic system adopts DC double coil, which is composed of two windings for starting and maintaining. It is switched by auxiliary switch. In order to facilitate the operation of AC power supply, the contactor is equipped with bridge rectifier.

③机械锁扣：当闭合线圈通电时，接触器吸合，机械锁扣锁住：当脱扣线圈通电时，机械锁扣脱扣，接触器释放，脱扣线圈在热态时，其电压在Us85%－110%范围内使接触器可靠释放。

③ Mechanical latch: when the closing coil is energized, the contactor is pulled in and the mechanical latch is locked: when the tripping coil is energized, the mechanical latch trips and the contactor is released. When the tripping coil is in hot state, its voltage is within US85% - 110% to release the contactor reliably.

工作原理：

working principle:

接触器的工作原理是：当接触器线圈通电后，线圈电流会产生磁场，产生的磁场使静铁芯产生电磁吸力吸引动铁芯，并带动交流接触器点动作，常闭触点断开，常开触点闭合，两者是联动的。当线圈断电时，电磁吸力消失，衔铁在释放弹簧的作用下释放，使触点复原，常开触点断开，常闭触点闭合。直流接触器的工作原理跟温度开关的原理有点相似。

The working principle of the contactor is as follows: when the contactor coil is energized, the coil current will generate a magnetic field. The generated magnetic field causes the static iron core to generate electromagnetic suction to attract the moving iron core, and drives the AC contactor to act. The normally closed contact is disconnected and the normally open contact is closed. The two are linked. When the coil is powered off, the electromagnetic suction disappears, and the armature is released under the action of the release spring to restore the contact, open the normally open contact and close the normally closed contact. The working principle of DC contactor is somewhat similar to that of temperature switch.

特点：

characteristic:

真空接触器熄弧能力强，耐压性能好，操作频率较高，寿命长，无电弧外喷，体积小、重量轻。

Vacuum contactor has strong arc extinguishing ability, good voltage resistance, high operating frequency, long service life, no arc external spraying, small volume and light weight.

缺点：

Disadvantages:

维修周期较长。真空接触器的真空灭弧室制造时工艺要求很高，如果工艺不良，灭弧室的真空容易下降。触头材料材质不好，在分断电流时会出现 "截流过电压"现象，即在分断电流时，由于真空灭弧室的熄弧能力很强，电弧电流不是自然过零时切断，而是从电流的某一值突然降到零，由此而出现高的过电压。截流电压会危及电气设备的安全运行。

The maintenance cycle is long. The vacuum interrupter of the vacuum contactor is manufactured with high process requirements. If the process is poor, the vacuum of the interrupter is easy to drop. The contact material is not good, and the phenomenon of "cut-off overvoltage" will appear when breaking the current, that is, when breaking the current, due to the strong arc extinguishing ability of the vacuum arc extinguishing chamber, the arc current is not cut off when it crosses zero naturally, but suddenly drops from a certain value of the current to zero, resulting in high overvoltage. The cut-off voltage will endanger the safe operation of electrical equipment.

除此了这些接触器以外，还有气动式接触器、电气气动式接触器、锁扣接触器等几种接触器。

In addition to these contactors, there are pneumatic contactors, electro pneumatic contactors, latch contactors and other contactors.

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