Contactor is mainly used as industrial control, generally the majority of motor load

Main circuit breaker protection is done right. Depending on the brand and model. You can open and close it manually or electrically. Installation are fixed, withdrawable in three ways. According to the current size and Voltage stabilizer level can be divided into low-voltage molded case circuit breakers, low-voltage and high-voltage vacuum circuit breaker frame. According tripping curve can be divided into different occasions. And the fuse is still a big difference.
Contactor is mainly used as electric meter, generally load to the motor mostly, of course, there will be some heaters do dual power switching and other occasions. Off the contactor coil voltage by controlling achieved. power transformers the structure can be divided into different interrupter vacuum contactors and general contactor. Depending on the control voltage can be divided into direct current contactors and contactor. Its main accessories for the auxiliary contacts. And itself does not have short circuit and overload protection capability, it is necessary and fuse, thermal relays used in conjunction.