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民熔真空開(kāi)關(guān)管是以上封蓋、下封蓋、金屬波紋管和陶瓷管等組成，該真空開(kāi)關(guān)管，外殼采用95瓷絕緣材料制成波紋式的瓷管，它具有爬電距離大、機(jī)械強(qiáng)度高、耐熱和耐沖擊的特點(diǎn)。真空開(kāi)關(guān)管內(nèi)封裝一對(duì)動(dòng)靜觸頭，觸頭材料采用耐磨且低截流值的Cu－W－Wc，這樣在滿(mǎn)足開(kāi)斷性能的條件下，減小開(kāi)斷過(guò)程中由于截流引起的過(guò)電壓，提高了真空開(kāi)關(guān)管的使用電壽命。當(dāng)金屬波紋管軸向運(yùn)動(dòng)時(shí)帶動(dòng)動(dòng)觸頭做分合閘動(dòng)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電磁系統(tǒng)考慮實(shí)際吸力特性和反力特性良好配合，以及發(fā)揮接觸器運(yùn)行時(shí)噪音低、節(jié)電的優(yōu)點(diǎn)，采用直流雙線圈由起動(dòng)和維持兩繞組組成，通過(guò)輔助開(kāi)關(guān)切換，為了便于用戶(hù)進(jìn)行交流電源操作，接觸器帶有橋式整流裝置。

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機(jī)械鎖扣：當(dāng)閉合線圈通電時(shí)，接觸器吸合，機(jī)械鎖扣鎖住：當(dāng)脫扣線圈通電時(shí)，機(jī)械鎖扣脫扣，接觸器釋放，脫扣線圈在熱態(tài)時(shí)，其電壓在Us85%－110%范圍內(nèi)使接觸器可靠釋放。

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:

接觸器的工作原理是：當(dāng)接觸器線圈通電后，線圈電流會(huì)產(chǎn)生磁場(chǎng)，產(chǎn)生的磁場(chǎng)使靜鐵芯產(chǎn)生電磁吸力吸引動(dòng)鐵芯，并帶動(dòng)交流接觸器點(diǎn)動(dòng)作，常閉觸點(diǎn)斷開(kāi)，常開(kāi)觸點(diǎn)閉合，兩者是聯(lián)動(dòng)的。當(dāng)線圈斷電時(shí)，電磁吸力消失，銜鐵在釋放彈簧的作用下釋放，使觸點(diǎn)復(fù)原，常開(kāi)觸點(diǎn)斷開(kāi)，常閉觸點(diǎn)閉合。直流接觸器的工作原理跟溫度開(kāi)關(guān)的原理有點(diǎn)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.

特點(diǎn)：

characteristic:

真空接觸器熄弧能力強(qiáng)，耐壓性能好，操作頻率較高，壽命長(zhǎng)，無(wú)電弧外噴，體積小、重量輕。

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.

缺點(diǎn)：

Disadvantages:

維修周期較長(zhǎng)。真空接觸器的真空滅弧室制造時(shí)工藝要求很高，如果工藝不良，滅弧室的真空容易下降。觸頭材料材質(zhì)不好，在分?jǐn)嚯娏鲿r(shí)會(huì)出現(xiàn) "截流過(guò)電壓"現(xiàn)象，即在分?jǐn)嚯娏鲿r(shí)，由于真空滅弧室的熄弧能力很強(qiáng)，電弧電流不是自然過(guò)零時(shí)切斷，而是從電流的某一值突然降到零，由此而出現(xiàn)高的過(guò)電壓。截流電壓會(huì)危及電氣設(shè)備的安全運(yùn)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.

除此了這些接觸器以外，還有氣動(dòng)式接觸器、電氣氣動(dòng)式接觸器、鎖扣接觸器等幾種接觸器。

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

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