接触器是一种用来自动地接通或断开大电流电路的电器，它可以频繁地接通或分断交流电路，并可实现远距离控制。其主要控制对象是电动机，也可用于其它负载，具有控制容量大、过载能力强、寿命长、设备简单经济等特点，因此在电器控制中应用十分广泛。

Contactor is an electrical appliance used to automatically connect or disconnect high current circuits. It can frequently connect or disconnect AC circuits and realize remote control. Its main control object is the motor, which can also be used for other loads. It has the characteristics of large control capacity, strong overload capacity, long service life, simple and economical equipment, so it is widely used in electrical control.

接触器利用主接点来开闭电路，用辅助接点来执行控制指令。主接点一般只有常开接点，而辅助接点常有两对具有常开和常闭功能的接点，小型的接触器也经常作为中间继电器配合主电路使用。接触器的接点，由银钨合金制成，具有良好的导电性和耐高温烧蚀性。

The contactor uses the main contact to open and close the circuit and the auxiliary contact to execute the control command. The main contact generally has only normally open contact, while the auxiliary contact often has two pairs of contacts with normally open and normally closed functions. Small contactors are often used as intermediate relays to cooperate with the main circuit. The contact of the contactor is made of silver tungsten alloy, which has good conductivity and high temperature ablation resistance.

接触器的动作动力来源于交流电磁铁，电磁铁由两个“山”字形的幼硅钢片叠成，其中一个固定，在上面套上线圈，工作电压有多种供选择。为了使磁力稳定，铁芯的吸合面，加上短路环。接触器在失电后，依靠弹簧复位。另一半是活动铁芯，构造和固定铁芯一样，用以带动主接点和辅助接点的开短。

The action power of the contactor comes from the AC electromagnet. The electromagnet is stacked by two "mountain" shaped young silicon steel sheets, one of which is fixed and covered with a coil. There are a variety of working voltages to choose from. In order to stabilize the magnetic force, a short-circuit ring is added to the suction surface of the iron core. After the contactor is powered off, it depends on the spring to reset. The other half is a movable iron core, which has the same structure as the fixed iron core to drive the opening and shortening of the main contact and auxiliary contact.

20安培以上的接触器加有灭弧罩，利用断开电路时产生的电磁力，快速拉断电弧，以保护接点。接触器制作为一个整体，外形和性能也在不断提高，但是功能始终不变。无论技术的发展到什么程度，普通的接触器还是有其重要的地位。

Contactors above 20 amps are equipped with arc extinguishing cover, which can quickly pull off the arc by using the electromagnetic force generated when disconnecting the circuit to protect the contact. The contactor is made as a whole, and its shape and performance are also improving, but its function remains unchanged. No matter what degree of technology development, ordinary contactor still has its important position.

然而，ABB接触器代理人员认为接触器因其特殊的工作环境，难免会发生各种故障，如果不能及时有效的发现故障并排除之，必然会对电气设备的正常工作带来影响，甚至导致电气设备烧毁的严重后果。

However, abb contactor agents believe that due to its special working environment, contactors will inevitably have various faults. If the faults can not be found and eliminated in time and effectively, it will inevitably affect the normal operation of electrical equipment, and even lead to the serious consequences of burning electrical equipment.

接触器的主触点是靠手动操作或电动合闸的。主触点闭合后，自由脱扣机构将主触点锁在合闸位置上。过电流脱扣器的线圈和热脱扣器的热元件与主电路串联，欠电压脱扣器的线圈和电源并联。

The main contact of the contactor is closed manually or electrically. After the main contact is closed, the free tripping mechanism locks the main contact in the closing position. The coil of the overcurrent release and the thermal element of the thermal release are connected in series with the main circuit, and the coil of the undervoltage release is connected in parallel with the power supply.

当电路发生短路或严重过载时，过电流脱扣器的衔铁吸合，使自由脱扣机构动作，主触点断开主电路。当电路过载时，热脱扣器的热元件发热使双金属片上弯曲，推动自由脱扣机构动作，主触点断开主电路。

In case of short circuit or serious overload of the circuit, the armature of the overcurrent release is pulled in to make the free tripping mechanism act, and the main contact disconnects the main circuit. When the circuit is overloaded, the thermal element of the thermal release generates heat, bends the bimetallic sheet, pushes the free release mechanism to act, and the main contact disconnects the main circuit.

当电路欠电压时，欠电压脱扣器的衔铁释放，也使自由脱扣机构动作，主触点断开主电路。当按下分励脱扣按钮时，分励脱扣器衔铁吸合，使自由脱扣机构动作，主触点断开主电路。

When the circuit is under voltage, the armature of the under voltage release releases, which also makes the free release mechanism act, and the main contact disconnects the main circuit. When the shunt release button is pressed, the armature of the shunt release is pulled in to make the free release mechanism act, and the main contact disconnects the main circuit.

接触器工作原理及会出现的故障内容就讲解到这里了，如果您有什么发现或者想了解的内容可以随时来网站www.jntongyu.com联系我们进行解答！

The working principle and faults of the contactor will be explained here. If you find anything or want to know, you can visit www.jntongyu.com at any time Com contact us for answers!