ABB contactor uses main contact to open and close circuit and auxiliary contact to execute control command. The main contact usually has only normally open contact, while the auxiliary contact often has two pairs of normally open and normally closed contacts. Small contactors are often used as intermediate relays to cooperate with the main circuit. The contact of AC contactor is made of silver tungsten alloy, which has good conductivity and high temperature ablation resistance. ABB small contactor is driven by AC electromagnet. The electromagnet is made up of two "mountain" shaped young silicon steel sheets, one of which is fixed and covered with coil. There are various working voltages to choose from.

为了使磁力稳定，铁芯的吸合面，加上短路环。交流接触器在失电后，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。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。交流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，普通的交流接触器还是有其重要的地位。

In order to stabilize the magnetic force, a short-circuit ring is added to the pull-in surface of the iron core. AC contactor in the power loss, rely on spring reset. The other half is a movable iron core with the same structure as the fixed iron core, which is used to drive the opening and closing of the main contact and auxiliary contact. The contactors with more than 20 amperes are equipped with arc extinguishing cover. The electromagnetic force generated when the circuit is disconnected can quickly pull off the arc to protect the contact. AC contactor as a whole, shape and performance are constantly improving, but the function is always the same. No matter to what extent the technology develops, ordinary AC contactor still has its important position.

小型接触器其实就是一种短路保护器，广泛用于配电系统喝控制系统，主要进行短路保护或严重过载保护。工作时，熔断器串连在被保护的电路中。当电路发生短路或严重过载时，熔断器中的熔断体将自动熔断，起到保护作用，常见的就是保险丝。另外还有断路器,俗称"空气开关",也是一种短路保护器,当过流时,它会自动跳闸,起到保护作用;熔断器、断路器都是保护电器。

In fact, small contactor is a kind of short-circuit protector, which is widely used in power distribution system and control system, mainly for short-circuit protection or serious overload protection. When working, the fuse is connected in series in the protected circuit. When the circuit short circuit or serious overload, the fuse link in the fuse will automatically fuse, play a protective role, the common is the fuse. In addition, there is a circuit breaker, commonly known as "air switch", which is also a kind of short-circuit protector. When it is over-current, it will trip automatically and play a protective role; Fuses and circuit breakers are protective appliances.

但它们不是一样.断路器是总称，它分为两种——框架式断路器和塑料外壳式断路器。框架式断路器俗称万 能断路器；塑料外壳式断路器俗称空气开头。他们具有短路和过载保护，可重复使用。寿命一般在几千次到几万次。熔断器是靠熔体熔化保护线路的一种电器，不可重复使用。保护以后需要更换熔体。

But they are not the same. Circuit breaker is a general term, it is divided into two kinds - frame circuit breaker and plastic case circuit breaker. Frame circuit breaker is commonly known as universal circuit breaker; Plastic case circuit breaker is commonly known as air circuit breaker. They have short circuit and overload protection and can be reused. The life span is from thousands to tens of thousands of times. The fuse is a kind of electric appliance which depends on the melt to protect the circuit, and can not be reused. The melt needs to be replaced after protection.

小型接触器与断路器的区别

Difference between small contactor and circuit breaker

他们相同点是都能实现短路保护，熔断器的原理是利用电流流经导体会使导体发热，达到导体的熔点后导体融化所以断开电路保护用电器和线路不被烧坏。它是热量的一个累积，所以也可以实现过载保护。一旦熔体烧毁就要更换熔体。断路器也可以实现线路的短路和过载保护，不过原理不一样，它是通过电流底磁效应（电磁脱扣器）实现断路保护，通过电流的热效应实现过载保护（不是熔断，多疑不用更换器件）。具体到实际中，当电路中的用电负荷长时间接近于所用熔断器的负荷时，熔断器会逐渐加热，直熔断。

They have the same point is that they can achieve short-circuit protection. The principle of fuse is to use the current flowing through the conductor to make the conductor heat up. After reaching the melting point of the conductor, the conductor melts, so the circuit is disconnected to protect the electrical appliances and lines from being burnt out. It is a accumulation of heat, so it can also achieve overload protection. Once the melt is burned, the melt should be replaced. The circuit breaker can also realize the short circuit and overload protection of the line, but the principle is different. It realizes the open circuit protection through the bottom magnetic effect of the current (electromagnetic release), and realizes the overload protection through the thermal effect of the current (not fusing, suspicious, no need to replace the device). In practice, when the power load in the circuit is close to the load of the fuse used for a long time, the fuse will be heated gradually until it is fused.

熔断器的熔断是电流和时间共同作用的结果起到对线路进行保护的作用，它是一次性的。而断路器是电路中的电流突然加大，超过断路器的负荷时，会自动断开，它是对电路一个瞬间电流加大的保护，例如当漏电很大时，或短路时，或瞬间电流很大时的保护。当查明原因，可以合闸继续使用。像上面贴子说的，熔断器的熔断是电流和时间共同作用的结果，而断路器，只要电流一过其设定值就会跳闸，时间作用几乎可以不用考虑。断路器是现在低压配电常用的元件。也有一部分地方适合用熔断器，这里不再深入讨论了。如果您对我们感兴趣请关注我们网站，我们会持续更新，更多相关资讯请关注：http://www.jntongyu.com

The fusing of fuse is the result of the joint action of current and time, which plays the role of protecting the line. It is disposable. The circuit breaker is a sudden increase in the current in the circuit, when it exceeds the load of the circuit breaker, it will automatically open. It is a protection for the instantaneous current increase of the circuit, such as when the leakage is large, or when the short circuit, or when the instantaneous current is large. When the cause is found out, it can be switched on and used continuously. As mentioned in the above post, the fusing of fuse is the result of the combined action of current and time, while the circuit breaker will trip as soon as the current exceeds its set value, and the effect of time can hardly be considered. Circuit breaker is a common component in low voltage distribution. There are also some places suitable for fuse, which will not be discussed in depth here. If you are interested in us, please pay attention to our website, which will be updated continuously http://www.jntongyu.com