The circuit breaker is protective, can extinguish the arc, and has the ability to segment. Contactor is the use of coil to control the circuit on and off, after the contactor is energized, the normally open is closed, and the long closed is opened, so as to control. 1, the circuit breaker is mainly protected, but it is not broken off when it is overheated, and its protection is currently more commonly used.

The circuit breaker is protective, can extinguish the arc, and has the ability to segment. Contactor is the use of coil to control the circuit on and off, after the contactor is energized, the normally open is closed, and the long closed is opened, so as to control.

1, the circuit breaker is mainly protected, but it is not broken off by overheating, and its protection is currently more commonly used in three sections of protection, both overload protection, short circuit delay, short circuit long delay. There are also some under-voltage, over-voltage and other protection functions. It depends on the brand and model. Its opening and closing can be manual or electric. There are three kinds of installation methods, such as fixed and drawer type. According to the size of the current and the grade of the working voltage, it can be divided into low-pressure plastic-case circuit breakers, low-voltage frame circuit breakers and high-voltage vacuum circuit breakers. According to the different trip curve can be divided into different use occasions. It's a lot different than a fuse.

2, the contactor is mainly used for industrial control, the general load is mostly motor, of course, there will be some heaters, do dual power switching and other occasions. The on-off of the contactor is achieved by controlling the coil voltage. According to the different structure of arc extinguishing, it can be divided into vacuum contactor and ordinary contactor. According to different control voltages, it can be divided into DC contactors and AC contactors, and its main accessories are auxiliary contacts.